Batman was physically exhausted when Bane broke his back. The times they've fought since then have been very different. Gambit wins easily. His speed, agility, and power set are too much for a brick like Bane. To win Bane either needs to connect with a powerful punch or grab a hold of him to do any damage. Gambit just needs one card and it doesn't even need to hit Bane, just in his general area. Gambit wouldn't be stupid enough to stand close enough for Bane to do any real damage. Bane would be reduced to picking up objects and throwing them at Gambit, hoping to get lucky.