Cavani hasn't signed for anyone yet, still contracted to Napoli.
Jovetic vs Higuain - correct, two different types of players there, Jovetic not an out-and-out striker as such by the sounds of it. In that case perhaps assists should be bought into the statistical breakdown.To be honest I haven't seen him play so it's hard to make judgement between him and someone else.
On the face of it you'd think we'd prefer just an out-and-out goalscorer looking at what we have in our squad. Plenty of players to play in behind a striker - Wilshere, Cazorla, Rosicky, and apparently that's the Ox' preferred position too.