Ya but Corsi wont tell you when any of those qualities either lead to a costly turnover or great play to lets say clear the puck. Every turnover isnt the same and being strong in the areas I just posted will lead to less costly mistakes. Let me ask you a question....If your pinned in your own zone and the puck is stuck in a scrum along the boards, which player do you have more confidence in that will win that puck battle and eventually get the puck cleared out of danger?
Naw forechecking and being a effective backchecker and understanding backpressure and positioning arent the same thing. To be a effective forechecker you sometimes just need decent speed and ability to track the defenseman and lay a hit. To be a effective backchecker it takes more hockeysense, read where the open player is and also seeing whos coming behind you. One of those most underrated aspects of the Leafs improved play last season was in its ability to apply significantly better backpresure then in previous years.
Corsi is a solid advanced stat. I'm not trashing it and saying that it should be completey ignored or anything of that nature just that it has holes. Clarkson and Grabovski are 2 vastly different players and alot of the things Clarkson is good at are the intangible things that the stats guys usually dont buy into.