^ The team would certainly have a better chance... IF they utilize weakness exploitation (ie. generating massive amounts of red sun radiation) right away. If they try to duke it out with Prime, they'd get annihilated just like ALL of DC earth's heroes did. Another factor that comes into play is when this battle takes place. If it's during the day, it would be exceedingly difficult to drain Prime, even with red sunlight -- if it takes place at night, that tactic becomes much more plausible.
Or if you're allowing BFR, the team could definitely get a forum win against Prime (without the GA) that way. With the GA, not even that maneuver would work.