Loma gets stopped. He has bad skin, if he was lumped up like that by Marriaga, no way he goes more than six rounds with Spence. His face would deteriorate quickly from blocking punches.
spence has a bad IQ. Only reason earl won 9-10 rounds against Garcia was because of the massive height, reach and size difference and Mikey is also not that fast. Loma is obviously a smarter fighter than earl and faster. Loma out boxes him.
That's not a question. Lomachenko is a lightweight, He isn't built to fight at even 140. He really shouldn't be afraid of going to 140 to fight an old man who is 6 lbs. heavier than he is though. Honestly I don't think Uncle Bobby would even put him in with Berchelt though.
I think rather than make random speculation, let's refer to the very words come out from Loma himself regarding his prospect of fighting in 147 lbs... "It's stupid"
Lomachenko understands his size limitations and this fight would never, ever happen. Not even a point in speculation.