So I'm researching all these to see how to get the most bang for my buck. In Vol. 4 it says it contains the Drift miniseries....which is also supposed to be in Vol. 7? (according to Amazon anyway). This has to be wrong obviously, but what is really included in this set. I'm seeing Transformers Infestation 1-2 and Ongoing 7-18. Is the Drift series really supposed to be the Ironhide series? I don't see that in any of the collections so far.