While slightly off topic, I thought this might be indirectly related because of its relation to expansion and gains.
I think OP said at one point you need to expand beyond your elastic limits to see permanent gains.
So the theory here is to pre stretch. Part of the idea of warming up is to put you in a more elastic state. (Also, to avoid injury, but not touching on that).
Wouldn’t both these things increase your elastic limits, as well as, providing increased expansion.
For instance muscles stretch less and injure easier when there cold. Therefore, exceeding elastic limits. Does it stand to reason we can reach elastic limits easier while cold and see gains, albeit with less overall expansion?