Stator is soaking in oil right there. It’s obvious you know what youre doing after cam chain and valves, if the starter is messing up you are probably right in your own diagnosis, i dont know how long between your work and the starter issues though
, just playin. Just change out to toyota starter many have done and rock on, you will need your gear and iirc you need the rebuild kit from england for a couple parts and its like 20 bucks. After the swap I haven’t heard of any of the toyota starters going bad.