Ancient History here but may be relevant, was hurt for '72 season, was offered the job of "spotter" for WTIC radio up in the booth at Memorial, ($10, I believe, lunch, and great view) of course had the 2 Deep Depth Chart in front of me. After whatever play, I would point to the player, who let's say made a good block on that particular play, motion with my forearm out for instance, to indicate, ie., "good block" and the color man, (most of the time), used that. Without that depth chart, yes, you would find a way I suppose, but you are correct, I see unnecessary complications for the broadcaster.