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Look out some of them bears are kleptomaniacs...
just my 2 cents on the matter but i ran into basically the same thing last spring on my bear hunt and it turned out to be porcupines. I got into an area with my spring tag that had a lot of "bear peels" and hunted it for a week or so. I didn't look close at the trees until i wasn't seeing any bears and then i noticed that the marks on the trees were very close together (like beaver teeth), not spaced apart like bear claws or bear teeth (like your pics 4 and 5). only noticed the "peels" on hemlocks so that was another indicator. Not saying that these aren't bears but don't waste time on them like i did because of the quill pigs. just trying to help cuz i'm no expert.good luck
Yeah those were made by a bear, looks like a couple weeks old though.