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Spence can do better in a rematch if its at 154 and he improves his defense and offense. He's the most one dimensional of one dimensional nikkas in the game. He's methodical to a fault.
If he doesn't learn to come forward while moving his head, he'll get pieced up by sharpshooters. This was the reason he backfoot boxed Mikey instead of just walking him down from jump.
Some jabs are too strong to block or parry, its better to slip and counter. Spence needs to add some variety to his offense.
Fighting Thurman would have prepared him for all of this, but dude was on some petty shyt.
I'd add another set of eyes to Spence and work on the shyt I mentioned, Take the rematch and keep it moving. Its still a money fight and everyone else will be trying harder when they fight Spence so his path won't get easier, especially at 154 where the real sharks lurk.
Spence should be locked in a room and forced to watch tapes of Roberto Duran for a whole week.