What do you like / dislike about Jennings / Ferrell?
Curious how you're evaluating.
I don't like how clumsy and weak Ferrell is. I don't see anything special in terms of burst either. I'm here to tell you... Length isn't everything. Turning the corner with length requires the bodily strength to get low and rotate your core in the right direction to run around the OT. Length just gives you a larger radius you can do this effectively at. Ferrell isn't super active with his hands and demonstrating he can be a force without coming off the edge either.
Jennings is very, very aggressive. This is something I prize anywhere on defense but especially in the front seven. There's stupid aggressiveness, but then there's consistent, smart aggressiveness like Jennings seems to display, and that tells me he's going to have a long career. He's also strong as an ox (not in the way Vernon Gholston had huge guns, but in the way that a heavyweight wrestler is hard to take down and never loses his balance. He's going to have a wicked bull rush once he bothers to try it. At the moment, he's fast enough to just run around the outside edge or give a quick rip/swim move to the inside. You could play him as a stand up OLB or a DE. I'm partial to 3-4 bases, but either way.
Bosa also has very good balance, and he has additional speed and flexibility that Jennings doesn't have. On the other hand, he's not as strong. He has tons of moves though, and he's great with his hands.
Pass rushing is basically a martial art of sorts, and I've been doing martial arts since I was in middle school (mostly wrestling but some BJJ more recently). That being said, there are a number of ways you can win, but if you don't even see that this is the type of game they're playing, you'll be clueless as to why certain players succeed/fail. Tons of 'elite' athletes washout in the UFC too because they aren't fighters, they don't know how to coordinate their body, how to react to an opponent, how to plan their moves, etc. It's rather complex when you start analyzing all of it.