I believe you're thinking about the conflict wrong. This is the two 40k fighters and the two Metroid fighters teleported to a location to battle to the death.
And also Creed can get himself a baneblade, anytime he damn well pleases. Especially if this conflict is important enough to ally himself with a Tyranid.
Of course if we're going to represent both at top power we could always give Creed a Retribution Class Imperial Warship, and Swarmlord his splinter fleet.
and Samus her ship.
The fighters have somewhat standard gear, that they use. So while Creed could possibly requisition himself a Sentinel power lifter, a Displacement field, a stack full of void and vortex grenades and a conversion beamer, he doesn't get that. He gets the equipment he uses.
No allies are allowed. This is the fighters as fighters. Not as commanders. (And in my opinion Creed was a really silly nomination because his noteworthy strength is as a tactician and strategist, not a fighter.)
No Baneblade for Creed.