This is the path of least resistance and the least costly route between the Weston Sub and the GTAA lands, parallelling Highway 427 on the west side.
As the GTAA is only planning for Blue22 (if it ever happens) as a rail link, negating most other possible ideas (they have a ban against locomotive-powered trains on their property, likely to give Blue22 the advantage), there is no need in their view for a proper rail station anyway. The roughed-in supports for the DMUs are ready, next to the T1 LINK station.
A DMU or EMU service could work, if it was a semi-express service, acting like a branch of GO with a Woodbine stop for connections to VIA and GO from Brampton. I could even see a premium fare for the privilege of riding it into the GTAA lands (like many rail links), as long as the fare is reasonable, especially for airport employees. A few stops along the way could make a 15 minute service quite useful for Rexdale, Weston and Mount Dennis residents and for transit connections for many others. MoveOntario calls for this rail link, hopefully it will be a public transit service like the rest of proposals in the plan.