While I am also a single 7/0 (or larger when silvers are running 8+ lbs) fisherman, I also know that the relatively large hooks cause significantly more damage to the fish, especially hooks thru the eye, but also bleeding, torn gills, etc. This doesn't mean I'm likely to change, because, as you know, using the single, big hook almost eliminates drive by' s. It is hard to change an old commercial fisherman. I do know that some coho survive fairly major trauma, having caught many apparently healthy fish, (back in the '60's) that were covered with obvious net marks and missing half of their scales, (Thanks to the Russian trawlers that were then working along the old 12 mile boundary line).
About three years ago, I also caught a healthy silver with a fully healed major injury. The lower jaw was split in two, where a hook had torn out. at least a two inch tear, possibly by a commercial fisherman who didn't know it was on, or had been shaken off the old way. This was a very unlucky fish, because when I caught it, it came in smoking like a Japanese Zero in WW II.