Stagecoach Manchester and Wigan

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RE: Stagecoach Manchester
Well I don't work for Stagecoach, but I can probably help with some of the reasons why what you suggest hasn't actually happened.
The Dennis Arrows and Olympians were found to be too unreliable for the school work they were assigned to. Stagecoach nearly lost some of this work earlier this year because of this, so had to promise Enviro400's would run for the rest of the year.
The B9TL's were not standard for Stagecoach in Manchester, so they were deemed more suitable for Scotland, hence their transfer. The Enviro400's were spare in Stockport due to a batch of hybrids being delivered, and the alternative would have been to transfer them instead.
The B10BLE's were basically deemed too old, and I think Wigan preferred to come into the 21st century with the MAN's.
Hope this helps.