You misunderstood. First, No one suggests throwing a full power swing with your shoulder from a kneel down position. Even the scoot drill does not do this.. The drill is to enable the bowler to feel the release as it comes off the hand.
Raising the shoulder off of the floor to a level even with the other shoulder will NOT cause any undue strain on the rotator cuff. There is insufficient force in this motion to do anything to it. Rotator cuff injuries are generally due to excessive strain in overhead arm motions and not in underhand motion. The rotator cuff is comprised of 4 muscles...the subscapularis,the infraspinatus,the teres minor and the supraspinatus.They help stabilize the humerus in the glenoid fossa. Severe pain often is the result of impingement of the supraspinatus tendon around the AC joint. Degenerative changes in the cuff are frequently due to ageing.
As for needing a surgeon eventually, most RC injuries can be treated with rest and strengthening exercises. Complete tears may require surgery but otherwise this is generally a last resort treatment by most orthopods. My basis for these thoughts are based on my 45 years of medical practice and the medical literature I read. I am a retired military flight surgeon with numerous dealings with pilots and other hard-pressed soldiers It was unusual to require surgery in most of the cases. There are, of course, always exceptions.
Further, as for your denigration of Ritger, his record is sufficiently appreciated by the vast majority of the bowling coaching world and many top bowlers such as Kelly Kulick...to simply say "de gustibus non disputandum est."You might want to re-read some of the articles about top coaches in BJI