Minato uses the contract seal to release the Edo Tensei. Also, Tobirama's Edo Tensei are factually weaker than Orochimaru's in Part 1. Physically, they are no threat to Minato, they don't get close to a faster teleporter at any point to matter.
The fact Tobirama is less reliant on FTG is a big weakness considering he's fighting the fastest shinobi in existence.
The fact Tobirama is less reliant on FTG is a big weakness considering he's fighting the fastest shinobi in existence.