This question already has an answer here:
We just recently started using the grapple mechanics in D&D 5e. I was wondering if it was possible to set up multiple opportunity attacks by grappling an enemy creature and then moving it out of your allies reach.
Since it is not specifically forbidden in any of the rulings pertaining to grapple or opportunity attacks, I'm inclined to allow it in my games. This does create a power balancing problem though, giving advantage to the bigger group (which seems only logical). Making an encounter with 10 low level enemies possibly more dangerous then an encounter with 1 high level enemy.
I would like to know if any other DM's have run into this issue, or maybe its no issue at all.