Sadly, no. GI Jazz on offense only has a bit of safety net and nothing to help him with damage or utility, while on defense he is worse at being a wall than Splitting Image or fellow Band variant Dream Band due to his armor and regen being absurdly easy to deal with. Even in the simpler times when Jazz’s SA could actually be considered decent, he was cursed with older AI that would tag out when the healing kicked in. By the time the AI was adjusted to consider buffs/debuffs for tagging, it was too late.