Btw, if youre squatting deep enough, it is highly likely that your deadlift will go up along with your squat, if you only deadlift it is not as likely that your squat will go up in the same fashion.
Definitely, since a "good" deadlift is like a 1/4 squat, so it doesn't have as much (if any) carryover to a full squat as a full squat does to a deadlift.
The point is - could a deadlift and deadlift alone be used to gain muscle/strength (forget about jump specificity and all that, just pure muscle)?
Because, if it can, then you can just deadlift to gain muscle and do plyos to tweak and tune that muscle to act explosively.
For example, if you were to do depth jumps followed by deadlifts, then you'd get quad and calf stimuli by depth jumping, and also much more specificity than a squat for jumps, and deadlifts for the posterior chain as muscle growth stimuli.