I'd assume Clark is brought in on all goaltending decisions, not with the final say necessarily, but why not get his opinion when he would know more than anyone else about them? Also wouldn't be surprised if that kind of elevation in role was part of what was offered to keep him here when things looked uncertain (and maybe after Brackett left management was sensitive to how much that would matter in keeping someone like Clark).
The Martin deal makes sense on several levels, it's virtually free (can't seem to find confirmation on this, but does future considerations literally mean just that, we'll figure something out, not anything with specific parameters like if he plays 30 games or extends his contract then you get a 6th, otherwise you get a 7th kind of thing?), he brings experience so we don't have two kids in net in Abbotsford, it allows Silotov to go to the ECHL to get more games than he would behind DiPietro, and if this season goes to the crapper then we could sell off Halak at the deadline, call up one of DiPietro/Martin to back up Demko for the remainder of the year and call up Silotov to replace the spot in Abbotsford.
And if Clark can work his magic and make something of Martin then that's just gravy.