Guidance from the official rules:
Moving through non-hostile creatures:
• You can move through the space of a friendly creature, but it counts as difficult terrain, meaning it costs more movement to traverse.
• You cannot willingly end your turn in a friendly creature's space.
• I am allowing it.
Moving through hostile creatures:
• Normally, you cannot move through the space of a hostile creature.
• Exceptions: You can move through the space of a hostile creature if it is at least two sizes larger or smaller than you.
• I will count this as breaking a grapple of the creature you attempt to pass, but it will be part of the move, not a separate action as you didn't actually have them grappled.
• Even when you can move through a hostile creature's space, it still counts as difficult terrain.
• You cannot willingly end your turn in a hostile creature's space.
• Except if you have successfully grappled that creature, then you are in that creatures space.
I knew there was something about not being able to break a line of enemies. After this round this new regime will take effect. Now you can legitimately surround an enemy and even if they disengage they can't easily escape.