I'm inclined to say Team OP now. All OP characters of such high level seem to be hypersonic+ in speed and I don't know if anyone in Naruto can even come close to such speed. I can imagine Naruto characters being near hypersonic speed at their very best but most likely just super sonic+.
Kizaru himself is capable of lightspeed once he gets going. Akainu has the power of magma which is probably as effective as Ametarasu, if not more effective. Aokiji probably wouldn't be so great here. Powerwise though you have to remember that the battle between Akainu and Aokiji completely changed the geology and atmosphere of an island, which is far beyond anything anyone in Naruto has shown, except for Madara.
Now Madara is the game changer here, he's massively OPed and can change an entire battlefield in seconds and then utilise every element of the now changed battlefield as he pleases. He can also create wood clones and each Wood clones can support a Susanoo. Then he has the Rinnegan which makes him practically a god and gives him access to every chakra type as well as all the other OTT powers the rinnegan has displayed. Now he has this perfect Susanoo, which has still to be revealed powers. However he has been "killed" quite a few times in his fight with the Kages and this is usually down to over confidence.
Itachi's a threat too but not a massive one. I can't imagine he'd connect with the sword of Totsuka because the admirals move too fast and the Yata shield is only stated to grant immunity to chakra based elemental attacks.
Sasuke won't be much good here imo, but has shown to have good team work with Itachi.
But like I said before I think the Speed and Sheer overwhelming power will give the admirals the advantage here. Madara's good but could quite possibly get speed blitzed and Akainu could easily set his forest alight with his Magma. Kizaru's lightspeed attacks should also pose a big problem and I don't think there's anyone fast enough to stop him from using his lightspeed attacks.