Jordan: We figured this is a good way to show that it figures into the main series, written by the same writer, and show where it takes place in that run. We couldn’t just slide the crossover issues into the main run, because it needed to take place over the course of the event, and we wanted to keep up our twice-a-month schedule. Well, now we basically get three per month during the crossover.
As for where to put it in your long boxes, that’s a great question! I guess that would depend on how you reflect Legacy numbers in your long box as is. Do you file all the Uncanny X-Men series as though they are one series, or do you file them as separate series? If you file it as one series, then yeah–you’ll want to slot these three issues in between issues 15 and 16 of the current run. If you put them separately, then file this with your mini-series. For my own part, it would be filed under Marvel\X-Men\Miniseries\W.