Geoffrey Bonnell was the CO of the 147th. Hudson says that he and Hartney, trained with the RFC and used to rotary engines, wanted to retain the N.28. Bonnell put up such a fight that he was posted elsewhere.
There may have been something more to this.
Ralph O'Neill seemed to think that Bonnell was a good CO who got steamrollered by the 94th "mafia"--that the 94th had the ear of HQ, supported HQ's questionable decision to adopt the Spad. Since the new German types were inline, German air strength was nearly all inline, and Bonnell thought that the rotaries could outfly them. The N.28 may not have been as rugged as the Camel, which served to the end of the war, but it was faster--nearly 20mph.
Bonnell knew rotaries: he started flying with 32 Sqn in DH 2's in 1916--he's in that group photo of 32, the tall man on the far left.