This is kinda interesting.
The forming pockets are within the same limits, 15-20 kms in "diameter".
Implications:
- limit of the defensive bubble Ukrainian weapons can provide (my problem with this explanation: these pockets aren't separate "bubbles" on their own, but part of a defensive line with the same reaching)
- effective reach of Russian weapons which they can close the bulges with "vertical encirclement".
Russians form these, their offensive movements shape the frontline, so for me the second explanations seems that has more impact on these forming, while Ukrainian weapons has some but not decisive effect.