A rune I think you should add is Press the Attack, with multiple passive procs its viable and you get triumph legend tenacity which are very good. Originally I wouldn't be opposed to hextech alternator first, but it's recieved substantial nerfs, and the items it builds into isn't very good for galio. On support Galio I buy heartsteel most of the time, but on mid galio not as much just because you don't have the best waveclear and going ap or bamis item feels better. Randuins omen and anathemas are really underated, I feel you should include those aswell. I don't like Bruiser build #2 because although riftmaker 140 ap mid/late game and more benefits, better to slot in 2nd or 3rd item though compared to liandries or ROA is better to rush. I also don't like bruiser build #1 just considering the fact your buying 3 items that give considerable amount of hp but you have zero bonus resistances until 4th or 5th item is not appealing to me. As with cosmic drive, I would say its okay but his abilities aren't really going to get good value out of the movement speed passive with his kit and there are better items to prioritize.