On a moderate dose of t3 and a steriod cycle, people can keep gains. ive did it before myself.Depends on the t3 dosage and the steriod cycle.
On sarms triple stack? i wouldnt be so quick to say they wouldnt keep gains on a mild t3 run,key word being MILD.People have reported little or no muscle loss on t3/clen runs.But why chance it? sarms products are a beautiful thing, which work very very well on their own.