Not sure he ever got a fair shot in Toronto, and I'd like to have seen him stick around with the Marlies, but with his history of strong underlying numbers, it's understandable he was claimed, and I'm not too worried that we don't have better options available.
Still, under Babcock, he was given some of the toughest usage in modern NHL history, taking pretty much all defensive zone starts against any given competition. Somehow his line, despite being massively outchanced and attempted, pretty much tread water in terms of actual goals...and he did his job of winning a lot of faceoffs.
With Keefe, he got one game, with like 5 minutes of ice-time and scored a goal. But Keefe knows, trusts, and likes his Marlies guys (Goat, Engvall, Timashov, Petan, etc), and it wasn't ever likely Shore would keep a spot over them.
Best of luck to him in Winnipeg.