Partnering with celsius is a very good move arbitrage trading can be done easily, celsius being a lender and jarvis being an assets exchange should be a nice tandem.
Indeed, this is a good direction for the development of this project. Such cooperation gives more confidence in a promising future. These guys are great, they made the decision on such cooperation.
I am not surprised Jarvis will offer lending services trough Celsius since it seems like they think of everything on many different levels. It seems this will really be one of the most diverse exchange out there. The question is, do users want complex exchanges or would rather use simple ones.