Like I have said before, if the Tekin fits our spec, I would love to have them in on this thing. The more the merrier...
As far as motors, for this class one motor is working just fine. As far as the Boss having the cooling holes, well, that's why Novak's endbell kit with cooling holes is allowed for the older motors. Everybody can still be on the same page.
I know in the past some have theorized that the 5000 or lower capacity will be better for lower power classes as the battery in naturally heated up more than a bigger battery...I don't know. Anyway SMC sells a 5000 50C for $32...Gens Ace has a 5000 40c for $39...Ea's 70c is $65..those are just batteries I looked up in about 1 minute so there's lots of batteries and price points in the 5000mAh range.