Haha, thank you ;) I think Veena knows more than I do about most of these things. She'll pop in when she can, I'm sure!
I would say that it's not necessarily the bicep that is unable to draw in, as there are quite a few muscles that attach in and through the elbow as well! Many of the forearm muscles, too, can affect your elbows. Having too tight a grip, and working on static, would put a lot of strain on those! And I know for me, the brief times I've worked on the Reverse grab, those muscles sure did have to work hard!
I would say, ease off a bit from those till the pain dies down and you feel better, and as long as other spins and other moves don't aggravate the problem, keep working on those! Pole dancing requires a lot of grip strength, I'm sure you know, so this one may just be taxing one particular forearm muscle in you than the others, and it's not quite ready. So, ease off, and then carefully ease back in! Try it once only, when you're better and no longer in pain, when you do your pole workouts. Be sure to give yourself rest days, and as you gain strength, you can eventually bring it up to twice each time you dance, and upward from there.
Though, once Veena has given her advice, I'd definitely take hers!