skchsan wrote:
From FRB:

When you move a unit, you can move any of its models (you can also choose not to move some of the models in that unit if you wish).
Whenever you move a model, you can pivot it and/or change its position on the battlefield along any path, but no part of the model’s
base (or hull) can be moved across the bases (or hulls) of other models, nor can any part of that model (including its base) cross the edge of the
battlefield. You can also rotate any movable part of the model (such as turrets and sponsons) when it is moved. The distance a model moves
is measured using the part of the model’s base (or hull) that moves furthest along its path (including parts that rotate or pivot).

There are no restrictions on moving through engagement range during a move; you simply cannot move across base/hull of other models when moving the model/unit.

NORMAL MOVE
When a unit makes a Normal Move, each model in that unit can move a distance in inches equal to or less than the Move (M)
characteristic shown on its datasheet, but no model can be moved within Engagement Range of enemy models (pg 4).

Note, you cannot be 'moved' within engagement range. It's a simple clarification/reminder on the conditions required to make a legal Normal Move - it must not be set up within ER or be within ER when making Normal Move.

ADVANCE
When a unit makes an Advance, make an Advance roll for the unit by rolling one D6. Add the result in inches to the Move (M)
characteristic of each model in that unit until the end of the current phase. Each model in that unit can then move a distance in inches
equal to or less than this total, but no model can be moved within Engagement Range of enemy models. A unit cannot shoot or declare
a charge in the same turn that it made an Advance.

Again, no clause that states the entirety of movement path must not traverse through the engagement range, just no being 'moved with engagement range'. It's a simple clarification/reminder on the conditions required to make a legal Advance - it must not be set up within ER or be within ER when making an Advance.

FALL BACK
When a unit Falls Back, each model in that unit can move a distance in inches equal to or less than the Move (M) characteristic
shown on its datasheet, and when doing so you can move it within Engagement Range of enemy models, but it cannot end its move
within Engagement Range of any enemy models – if it cannot do this then it cannot Fall Back. A unit cannot declare a charge in
the same turn that it Fell Back. A unit cannot shoot or attempt to manifest a psychic power in the same turn that it Fell Back unless it
is Titanic.

Here we see a bit of difference in how the wording is construed - when making a Fall Back, unit/model can move while within engagement range, but 'it cannot end its move within engagement range.' It gives you a specific permission to make a special type of move when you are not normally able to because models within engagement range cannot be moved. It's a clarification/reminder on the conditions required to make a Fall Back - it must not be set up within ER but can be within ER when making a Fall Back.

FLYING
If a unit’s datasheet has the Fly keyword, then when it makes a Normal Move, an Advance or it Falls Back, its models can
be moved across other models (and their bases) as if they were not there, and they can be moved within Engagement
Range of enemy models. In addition, any vertical distance up and/or down that they make as part of that move is ignored.
However, these models cannot finish their move either on top of another model (or its base) or within Engagement Range of
any enemy models.

Now, the underlined portion which seems to be causing the disagreement, is actually the same wording as provided in the rules for falling back. This is actually stating that: "a unit cannot be selected to make a Normal Move or an Advance but can remain stationary or make a Fall Back while within engagement range of enemy unit. However, if the unit is a FLY unit, it can still be selected to make a Normal Move, Advance or Fall Back despite being within engagement range of enemy at the time of being selected to move."

There's nothing in the rulebook that states models cannot traverse through enemy model's engagement range while moving the model - it simply cannot move across/over/through other models' base/hull.

We can continue to disagree, and I am more than happy with agreeing to disagree, but IMO the rules are pretty clear cut.