Solidus Snake vs. Dante

Several ways to appoarch it... an easy opponent. First of all, Solidus' attacks can be easily predicted. You can see his moves from miles away, and there is not reason why Dante couldn't just dodge them.

That is completely a thing they put in the game that the AI did. It is equal to a pattern of magic attacks used by opponents. In a simulated battle, it means nothing.

Jump to avoid the ground sweep, (or simply keep himself out of the range)

While he's jumping, Solidus could put on a boost of speed and when he goes to land, he could impale him. Also, he could, again, put on a boost of speed. Dante couldn't stay away from Solidus for long.

walk or quick roll to avoid missile,

Again, a boost in speed would put in right at Dante while he's just ending his flip.

Dante can only win if he gets in super-close. And, while he's super-close, Solidus has two arms and two tentacles attacking him. Are you expecting me to believe Dante could get passed the two arms and Solidus blades and strike a fatal blow? I don't recall hearing he was like the Flash. And, if Solidus thinks he's in danger, he could simply blast himself out of danger or use his snake-arms to propel himself away.