Hey, I cannot fully recall a minimum funding for every Carleton MSW, but in my acceptance letter they said they allocated funds based on availability and I Believe for TA/RA positions, its given to top 3 students with the highest marks, however anyone else can still apply to be a TA based on the 'outside priority application' criteria.
I also got into York and I am going to accept York as their funding was much more that Carleton, as you mentioned each students gets a minimum $10, 000 plus more based on GPA. They said that we could apply externally for TA/RA positions, plus right now based on the situation, I am not considering a move. Hope this helps