You have to look at this like A) Maidana himself was a lightweight too at one point and B), sparring is sparring, and C) Spence is a big Welterweight, unlike Mayweather who Maidana fought so the size difference and physical strength difference between Mikey and Spence will be noticeable after a few rounds.
I remember these vids. I dont think Lomachenko fight happens if he goes to 147 for Errol. He is gonna bulk up and make it difficult to go back to 135.
Mikey tryin to fight Spence this year. He isnt gonna bulk up lol. Just fat