A charge system could work for Kaiten, but it goes against the apparent design philosophy they went for in 6.1. They seem to be attempting to reduce the damage SAM does in the 2 minute burst window, hence the nerfs to Midare and Ogi potency and buffs to the basic combo. Kaiten charges would be pooled for and used almost exclusively in the burst window, and only used outside the window to avoid capping. This would actually leave SAM damage more heavily weighed toward burst than the old 6.0 system where Kaiten was used to buff every Midare even outside of burst.

Also, just like now there wouldn't be a point to a kenki gauge. Now you'd have to watch two resources, Kaiten charges and kenki, when the point of a gauge is supposed to be to have a shared resource to monitor.

I'm not opposed to the suggestion, but I think it'd be better if they just restored the job to the way it was. It worked perfectly fine. No need to encourage them to muck around with the job mechanics without good reason. But they seem to want to do that anyway, so /shrug.