Fairly close 44, They are essentially stand-up defensive ends, and so they also need to be able to read the play and defend the run by setting the edge, rather than just affect the play by charging up field. I agree they have to be able to be horizontal to the line and pursue as well as rush.Not sure how to explain this but guys who put their hand in the dirt rarely can play "up" effectively.A guy like JJ Watt is the exception to that rule as he plays both. However JJ was a converted TE... athletic freak.
I liked to use leverage and power in my game where as a "phant" wants to use speed and deception,he has to be able to play the field side to side not just attack forward. Jones in my opinion and Perry both lack the motor and are not built to go side to side. Not sure how else to explain it. Crease and or Mark might be better at it than me.
Honestly Matthews is the best player for that spot... go draft a MLB and put Clay in the position where he can cause the most damage.