agreed here. the point of using bottle bac is for the quick bioload carry, nitrite won't matter.
but that disease prevention protocol though...the fritz alone would carry the fish and implant onto surfaces in 48 hours or less so being a week out is fine for the wait, and additional bac added but bringing in disease is the real risk to the fish, not filtration issues. disease is the direct tradeoff to quick cycle ability, we are seeing in pattern.
nobody's fish die or fail to eat since they're not being burned, bottle bac works well.
they die by month eight after skipping disease protocols found in the fish disease forum. and the loss rate is high, very high.
the loss rate for bottle bac+ fish in cycle? zero. I can't find one single time that failed. for years the rumor was that it was harming fish with initial ammonia burn but we can see that's not the case in today's bottle bac verification threads, they're filters in a bottle legit.