However, Tobirama could counter this fact by flooding the ground where the kunai are placed, forcing Minato to teleport to a kunai under water or the one he has in hand, or just trying to out match Tobirama in natural speed.
It’s unlikely that either man would be able to get their mark on each other due to both their understanding of the jutsu.
With the battle field flooded and the terrain advantage being in Tobiramas favor, Minato could summon Gamabunta to avoid Tobiramas powerful water style ninjutsu.