I'm a Groves fan. I have heard several real concerns about him though. While his straight line speed is truly phenomenal, he's got stiff hips and his cone drill and lateral agility have really come into question. People wonder if he can cover well enough or if he's strictly a pass rusher--abeit a good one. There are also concerns that he's going to have a much tougher time adjusting from DE to OLB than guys like Long and Gholston.
Personally, I've seen the kid play and I'm convinced he's going to bring the heat off the edge. He's got a fantastic first step and is a rocket speed rusher. Yeah, he may not be the best at angles or the best tackler, yeah he may not be as functionally strong as he should be, etc., but dynamite pass rushers are worth their weight in gold, and if he can do that--and I firmly believe he can--then I'd love to have him even if he's a situational player. I think he's going to be an every-down LB, and while his strength will always be pass rushing, I really like Groves.
Everyone talks about Gholston being a great package, but he's only truly superior to Long in one category, speed. I don't understand why all those people who drool over Gholston aren't also drooling over Groves, who has more speed than Gholston and is an absolute freak speed rusher.
As for Avril, he's a good athlete and I like him too, but I don't think he plays as fast as Groves. In round 3, absolutely, in round 2 .... I'm not so sure. I like both of those guys though. They bring the heat.