The fact that he's scoring and very hard to kill means that if he's in a unit of
LG on an objective in the opponents deployment zone his unit is essentially worth 8 victory points all by their lonesome (1 for linebreaker, 1 for slay the warlord that you are denying, and a 6 point swing for the objective). That alone makes him good enough to consider over just about any other
HQ. That's a pretty massive impact on any game.
Plus, since you are making him your Warlord, you can roll on the chart that has the most likely chances of have a positive impact ( the name escapes me, but the one that has the chance to give you
FNP in the opponents deployment zone, as well as a handul of other decent results). Go balls deep with him, throw a res orb lord in the unit with
MSS/
SW/
WS to take on challenges, ratchet the
LG up as much as you can, and then drop that whole kit and caboodle on an objective and call it a day. Laugh historically as your opponent tries to shoot through 10 T5 3+/4++
RP 4+
FNP wounds (assuming you get a little lucky with the
FNP Warlord trait). It's a might investment, but for a near guaranteed 8 Victory points? That's a pretty massive deal.
Try pairing the above up with a couple of bricks of Res Orbed Warriors to cap your own objectives, supported by maybe a
GA or two. You really don't even need to kill anything, just camp the objectives and laugh as your opponent struggles to amass significant enough firepower

.