I have an old Gi that is in the garage and I do lapel P/U's. I think the towel might be thicker then the lapel and would be a different kind of adaptation. I also do static holds with it where I will hang from the Gi for time or get at the top of a P/U and do an entire body crunch and hold that for time like I was doing a choke. I think that length of time you can apply a solid grip is more valuable than maximal strength when grabbing. Since everything is so dynamic in BJJ and you are always moving I want to be able to grab a collar and use that to control my opponent no matter how he moves. Does that make sense?
I could not imagine doing GTG with it though as my hands hurt pretty much all the time from training. I haven't decided if I am getting old or what. Heck maybe I need to do GTG. I definitely will be doing a ton of Gi P/U's in front of this next tournament.
What we think, or what we know, or what we believe, is in the end, of little consequence. The only thing of consequence is what we do. -John Ruskin