I agree with Steve, Nabeel, it is the less common variant, but I have seen a few of these. Often you will find that the subscap tear is chronic in nature and it is usually the superior insertional fibers. This allows for the biceps pulley apparatus to become compromised on the medial aspect allowing medial migration of the LHB up and over the groove. This is the same biometrical wear pattern that Steve has described in the usual pattern – but in reverse – the biceps migrates medially, becomes overloaded and fails.
If you couldn’t fault supra, its fine
Dan