Talking run D first here I take it? If yes, that's a fair assessment.
Players primarily use the best assets they have. Both Allen and Bosa have more lower half power, but even they look different to me... more alike in their approaches as compared to Myles, but not exactly the same. All also tend to start from DE positions that accentuate their attributes, with Allen the tightest and Garrett the widest, and angles dictate engagement.
I see all colliding with shoulders involved. Of the three I see Allen the most square more of the time then using his hip snap and press strength to separate and control, and, as I've said before, his press-outs tend to move his blocker backwards. I don't see that in either of the other two. Allen only tends to "burst" if he sees a gap created by a pulling OL, usually an OG. He's as pure a read-react DL as there is in this draft. He honors the run first, then reacts to pass. When he does, if he does not have contain responsibility, which he seems to have quite often, then he usually converts his "lock" to a pull of the OL's breast plate followed by a swim.
On the other extreme Myles does tend to lead with his inside shoulder reinforcing his blocker's natural, and understandable, anticipation of protecting "wide first". He uses his sudden stop to separate in run D getting a free "lock" until the runner declares. He only seems to situationally sell out to his pass rush, which out of a 3-point is almost universally a speed-edge rip. From a 2-point he's more likely to swim or spin inside. So he has more to develop, but has shown all the tools.
Joey? Kind of a hybrid... has more moves all primarily out of a 3-point. Longer body, but shorter arms than Garrett. He has the techniques down. Physically gifted, but not a gifted as Garrett. Strong, but not as strong as Allen. He can get stronger and certainly will gain experience. He's going to be good for a long time, but he's about as good as he's going to get. Certainly much closer to maxxed out, than Myles is.
Hope this makes sense... written over about an hour with multiple interruptions...