Getting stronger does allow for a longer stride, but ultimately the limiting factor is limb length, because strength gains cannot continue forever. Trindon Holiday can get as strong as he wants, but his stride length will always be considerably shorter than Usain Bolt’s, because Bolt is a foot taller than Holiday. While strength goes up, stride length goes up, but strength gains are limited by physiology, and therefore stride length gains are limited by the same factor. If you compare the stride lengths of top athletes, I bet you’ll find the biggest correlation is with their height, as their strengths are all quite high.