To put you opponent in his place:
On the
SMS / Drone issue, ask him to find the
SMS set of sats, Armor Save, toughness,
Init, etc. What kind of unit is
SMS? If he points to drones, shake your head and ask for the
SMS stat again. He won't find it.
Point to the weapon table, where
SMS is listed. Marines don't have a range, neither do Fire Warriors, nor Marneus Calgar. They aren't weapons,
SMS is.
- - - - - - - - - -
That might get through his thick-headedness.
Once he can't find it, inform him that
40k is a Permissive Rule Set. If the rules say you can or may, then you can or may.
If it doesn't say so, it ain't so.
I hope that helps.