It's pretty safe to say Shunsui would be a match for even Ulqu's 2nd release form, knowing Shunsui's shikai and by what rules it goes into effect it's just not possible for anyone to simply overpower it because you can't.
Also saying Starrk isn't strong, FYI he gave one of the strongest captains a hard time and took down more then one Vaizard - which in turn happen to be ex captains, so that tells you; 1. they're pretty damn strong even without hollow masks, 2. the fact that they have hollow masks and had plenty of time to control and master them and 3. the fact that he took them down that easily shows you how powerful he is. It's without a doubt that not even Ulquiorra in his second release form could do anything against those mass cero explosions.
Now about Ichigo's hollow form, it's not too early to assume his inner Hollow is a Vasto Lorde, now why would the writer mention them if not use them - simple, he did use them by making Ichigo's inner hollow one. Altho it will be quite some time before we get to see that form again I think and even then I doubt Ichigo will be able to fully control himself.
To get a bit more on-topic now; what I think about the Espada numbers? well to be honest I really think Halibel shouldn't have been Nr3 nor that Nnoitra should've been Nr5. Ulquiorra would've been much more suited for that number 3 position moving Halibel down to 4 and then moving Nnoitra down to 6 and Grimmjow up to 5. Also Yammy being number 0 all of a sudden was quite lame but I doubt he's any good as Byakuya and Kenpachi are taking care of him with quite some eas if I remember correctly
