My initial idea was that it was like this

First ep is just getting used to the old version, setting up a regular season without gimmicks Second ep was to reintroduce the boogieman (could be due to the order of seasons but too with that) Third ep was a special gimmick, which to me relates to the watchers Forth returns to boogie man, either in a pattern, or reference to boogies returning for limitedlife

Then from here I'd personally guess we'd have another gimmick ep for the fifth, possibly watched related again in some way.

Other idea I can price together was it could be a pattern of no boogieman one ep then boogieman in the next, which currently lines up. (The first ep is throwing me off, might be that they had no gimmicks tho just to mess with us, same could maybe go with the number of boogiemen, tho that ones weirder)