It would be useful to hear if anyone on this forum is able to state that they left during training without completing the proficiency check. Did they follow the rules and report this to the FAA? Did they get a job someplace else?

It seems to me that there are many people who leave the regionals during training for various reasons. The most common is that they were too far behind and left because they felt they weren't ready yet. The decided to get some more training, and try again later.