So their Grade/Group 1 winning form may not have been 120+. So what?
So what? They shouldn't be stallions, just because their form has a few holes in it?
Lord Shanakill raced 18 times in 3 seasons. He won 5 times, including a Group 1, 2 Group 2's and a Listed race. He placed on 7 further occasions, including in the Lockinge, the St. James's Palace, the Dewhurst and the Morny. He offers variety to breeders. I think he is one of the more exciting stud prospects. I don't care if his Dewhurst was arguably 112 or 120 or whatever. He has enough solid form in the book to be sent to stud.
And even when it comes to form, you are some man to twist facts, Hamm. "Alfred Nobel finished comfortably down the field in sales races at 2". He ran in one sales race. He was drawn on the wrong side. He comfortably won "his race", but had no chance with the other side. He finished 5/22, but 1/13 on his side. He had already won a G2 and a G1.
Vale of York may be one of the weaker Breeders' Cup Juvenile winners, but he was a Breeders' Cup Juvenile winner. Horses with far worse credentials succeed at stud. If you prohibit a horse like him from going to stud, you would only have 15 or 20 new horses each year from UK & Ireland.