Roasted eldar? Why would you want that? Not even a gaunt would be full after an eldar. Just skin n bones. The storm of splinters they rain and the terrible unimpressed Terminatau/Tauminator looks like a certain Dan Abnett wrote the script ... =)
Thats why the imperial guard use demolisher cannons siege mortars and super heavy tanks.
No infantry no problem!
Only cold steel and courage!
and heartless execution against the enemies of mankind!
(or use a bunisher gatling cannon with 3 heavy bolters and a stubber plus a co-ax heavy stubber with a tank ace like Coron Grizmund or Commander Pask n every heavy infantry and monster cry for her mommy XD (its true!) )
so johnson hasn't got a heavy flamer
hes got an inferno cannon
HAH, IT'S CALLED 2+ ARMOR SAVE AND 5+ INVULNERABLE SAVE, D'ELDAR PRICKS!
Though, this XV-99 Anvil-Hammer suit probably has the added advantage of being able to Re-roll failed saves because of Tau-Mastercrafted armor.