Pain from pancreatitis can raise the BG so that may have had something to do with it, but without seeing a lot more tests, it's impossible to say if Kuma might be heading for remission
Yes, some cats do go into remission, but what we do here is gradually reduce their dose until they're on just a drop (as long as they continue to stay in normal numbers) before going off completely. We don't want to "rush" their remission....we want a good strong remission, not a fast one!
As I said above, I think your vet probably doesn't really know what he's doing. If Kuma were mine, I'd probably start over at maybe 2 units (IF he's over 200 at Pre-shot tests) and then get at least one mid-cycle test in on that AM cycle (if at all possible) and then a PMPS (PM pre-shot) test and a "before bed" test. Post on the ProZinc forum daily and let the people who are experienced with your insulin guide you. I promise they won't steer you wrong and our number one rule here is to keep your kitty safe!
What's most important is finding out how LOW the dose is taking him. It's totally possible that he's been going too low already, and you just haven't been testing enough to know about it.
When they go too low they can "bounce". Bounces are when the liver releases stored sugar and hormones to bring the blood glucose back up quickly. It's kind of a leftover "survival mechanism" from when our cats were wild...if their blood glucose dropped too low, the liver would release those sugars and hormones to bring them back up...so hopefully they'd be strong enough to hunt again and survive.
Same thing can happen if they just go lower than their body has gotten used to being at. By the time we get a diagnosis of diabetes, most of our kitties have been diabetic for quite some time and their body has gradually gotten used to living at much higher numbers...then we start giving insulin which brings it down to normal numbers (or even a little lower) and the liver causes another bounce.
Keep asking questions too! The people here are very generous with their time and really just want to help you and your "extra sweet" Kuma