I imagine Sky Garry would know which Prime is which and what crew he has - according to the AllSpark Almanac II, he's head of the Transportation Guild (which I am going to assume is part of the High Council, if not, well, it is in the Crescentinuity). Though technically speaking, Prowl's not an "official" member of Optimus Prime's crew. XD
He's here in the Cyber Ninja Dojo to pay respect to the fallen ninjabot. Now he's going to help solve the mystery because, duh, Prowl, he wants to tap that again. OH HO HO!
Darn it Sky Garry can't you tell you're a turn off to Prowl now?! Darn love sick puppy....he's sure going to fall hard when he hears Prowl is living with two bots.