Using all attack they have access to is the whole point of Zelaron melee.
Of course some character cant have access to everything they had because of special limitation.
Like X that actualy started as Blue Bomber, became Rockman, MegaMan then X. It would be impossible for him to have all those weapon equiped in one suit. Also, at a few occasion he did receive big modification which would render him incompatible with weapon he had in the past.

Like i said in a earlier post Cloud does not defeat weapons in 1on1. It's actualy with 2 partners and using spells/summons and items which he doesnt have on Zelaron melee. Now tell me something.

Can Cloud even stand a chance without ally, materia and items against any of the weapons ? The awnser is no. He would get destroyed.