Still Tobirama scales higher

Not really. SM Kabuto fought EMS Sasuke & Edo Itachi simultaneously even though they were holding back, Sasuke implies near the beginning of the fight that he was going to use a lot of his power.

What about Tobirama's speed advantage

He kept up with Edo Itachi & EMS Sasuke simultaneously and dodged Sasuke's Susanoo arrow (something even FKS Kakashi couldn't do).

While I still think Tobirama I faster I don't think he has a wincon unless we say he can instantly use tandem paper bombs

He can't. If he were to try it, he would kill himself.

Regardless tobirama is a tough enemy , i do wish we got to see what his egos looked like

EMS Sasuke was getting scared of Tobirama so im just picking him. Sasuke was able to fight with Kabuto though

No Edo Tensei..? Tobirama would win high diff.

Kabuto SM easily low diff Itashi Edo. Tobirama can also low diff Itachi Edo. It’s a egality but since Tobi says himself he can win, he win

Base Tobi >= Kabuto SM = Edo Minato >>> Edo Itashi

If it’s Edo Tobi, Tobirama win low diff since he can beat Kaguya