Pick it up for the parts but ask if you can get the receipt signed by his buddy (the original owner, as long as they are telling the truth). Take that to the MTO and tell them it has a lost ownership. As long as the paper trail is intact (registered owner signs bill of sale over to you) with no middle man they should give you a new ownership (which I believe you have been looking for).
A receipt to the seller from the original owner and then another receipt to you is another option but the middle guy can get his hand slapped for not transferring ownership to his name.
Build a complete trike with this frame and VIN and part out the rest.
My Rides
1985 250R original (Garage Queen)
-under restoration
1985 250R black and blue full rebuild ( Daily Rider)
-Paul Turner pipe
-+2" Westcoast
1985 Red and White Tecat-EH Sold
1985 Green Tecate Sold
My Wife's Ride
-2003 Suzuki LTZ 400 Showroom fresh and completely stock
My Kids Ride
-2004 Yamaha Blaster, Completely Stock
-2006 Yamaha Blaster, Completely Stock