Marigold's contract is only design, build, and I believe partially finance. TransEd's contract is design, build, finance, maintain, operate.
I strongly suspect Edmonton will negotiate a operations contract with TransEd at the least, maybe even maintain, although, ETS has existing in house knowledge on LRT maintenance.
Similar thing as Ottawa. RTG is operating future extensions that they were not involved in the construction.
Let's not forget, as part of this extension, the Gerry Wright OMF is being added onto to support the expanded fleet of LRV's, so infrastructure for the VLW is also being built along the existing VLSE.