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With the size of avatars, mini-avatars, and small devices, I don't think the "OP" would be legible, and it would not occur to me that a dot would be for thread starter. Add to that, OP is a legacy term that oldschoolers use.
Even FB does a banner, when you're on a verified page and they reply. Banner is better imo.
If you are doing an avatar overlay will "OP" be in phrases, and if so will it look okay if adding words? Just curious. I'd perhaps use the word "Author" as to not get too lengthy. Thx.