Edit: Sasuke got owned by A, Itachi would have difficulty with him too
Not really the Sasuke who fought A only had rib cage susanoo and wasn't experienced at using the MS. Even still, A lost an arm in that fight but what exactly did Sasuke lose?
Kisame is way too durable
a rasengan won't kill him
Itachi is a crown clone user
also he's speed matched KCM Naruto
I doubt Minato can "speedblitz" him
there's no much difference imo
people tend to overrate Minato
ofc he's faster than Itachi but not by miles like fanboys believe (same case as A all his fanboys believe he can speedblitz everyone)
1. A rasengan from KM Minato will obliterate Kisame. I hope I don't have to post scans but given how powerful SM Naruto and SM Jiraiya's rasengans are, KM Minato will have even stronger ones.
2. Since Minato already has seals prepped everywhere, Itachi won't have a chance at using clones before he gets blitzed.
3. KCM Naruto was just a clone and it has been shown that unlike the likes of A and Minato, Naruto still doesn't have full control over his speed.
@Minato "owning" A and Bee logic: A and Bee back then were very young compared to now. Killer Bee didn't even have mastery with his various jinchuriki transformations while that same A was considered inferior to old Hiruzen.
Current A and Bee will stomp Minato.
As for who wins, well Minato can blitz one of them but then the other would be able to use his jutsu. For example, if Minato chooses to blitz Itachi, Kisame will have enough time to activate water dome where he can chill because if Minato goes in there, he loses his cloak and then Kisame can finish him off underwater. If Minato chooses to blitz Kisame, Itachi will manage to utilize susanoo making Minato's attacks useless. However, KM Minato should be able to at least out last Itachi and avoid all his attacks.
So I say it can go either was 50/50.