I agree entirely with you. The reason we don’t see flow in the cuff tendons is that we examine them under some tension. When you do correct cuff interval vascularity assessment you have the cuff relaxed and transducer pressure very light and you may see flow in the subscap and SST if there is some tendinosis. I think this is a real finding and may be helpful to suggest a degree of tendinosis.
You may see flow in the bursa with bursitis but I am not sure this makes me think of an adhesive bursa, rather just a synovium proliferative bursa. The only way I can predict adhesive bursitis is by looking for a complex echogenic structure to the bursa in B-mode and far better, how they respond during injection.
