Darkseid could put an unlimited amount of avatars on the battlefield if he wanted to. What would the Runner do? The real Darkseid could be looking on and blast him with the Omega Effect while he is dealing with avatars....then open up a boom tube and send him into the source wall...runner is not escaping the source wall.
you only have a handful of beings that are going up against a near Galactic level being in Darkseid...not to mention a planet full of Daxamites..then there is Validus....and why not have Yuga Khan on Darkseid's team too...he is his father....Yuga alone would destroy that team.
I think Wolverine would have a better chance at invading Latveria and taking out Dr. Doom than this particular Marvel team taking Apokalips