It is fine to take time off here and there so I would definitely recommend it. I would also suggest a complete overhaul of his strength and conditioning regiment. Roughly every 4 weeks his program should change. Is it? Also, what kind of lifting regiment is he on right now? In all possibility, the routine he is on is not helping him improve on the mat.
For agility work I would recommend short distant movement activities. Everything included:agility ladder, linear/angular acceleration, lateral movement, change of direction, coordination, balance, power,etc. There is a lot more to a strength and conditioning program than just running and lifting. I'm trying to do clinics all over the area before I move to Chicago but unfortunately coaches aren't recognizing that the things they are doing aren't just wrong...they are dangerous!! I'm going to be in NY for another week so if the thought of a clinic or consultation is in the budget I'd love to help you out.
If you want to read more I have a few websites that might interest you.
www.sportsspeedetc.com (my mentor's site)
www.developingathletics.com
www.sportspecific.com
Thanks for the reply and I'll talk to you soon.
Will Haskell
Athletic Development Specialist