This post isn't scientific. You started a different exercise system after cultivating the gains of an intensive, 6 year long flexibility program. One of the major limiting factors for lots of weight lifters is lack of flexibility, and a huge part of why people stop weight training is joint problems, which stretching helps with.

It would be like if a power lifter began running triathlons alone and claimed that their enormous tree trunk legs from 5 years of dead lifting had no bearing on their times.