I had an 80% tear on my left arm Dec 2008. I thought I just pulled a muslce in my arm. Kited in Barbados Jan 2009 for a week and my kiting brother in-law (orthopedic surgeon) tested my arm on the beach and said you have a distal biceps tear. I said no way not much pain. I had it checked when I got home and sure enough it was torn (incomplete). Much debate on whether to get the surgery or not since partial tear. I got five orthopdic opinions the only one that said get the surgery was my brother in-law
I ended up not getting the sugery and just rehabed it until May 2009 and kited in SPI (with my brother in-law) full on with no problem. Now I wouldn't even no it's there. I can do as many chin ups, unscrew jars, etc. as before the tear.
So I think as long as rehab is going OK then go for it.