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Major League Soccer officials announced Wednesday that the MLS SuperDraft will return to a three-round event this year, and the following Supplemental Draft will also consist of three rounds. (source)
They've added a third round to the Supplemental Draft. So there are 6 rounds between the two drafts, and previously traded 4th Round SuperDraft picks will just be shuttled over to the first round of the conference call.
Source? Or did you just pull an MLS and make that up?