I wish I had brought with me a sample ballot for DMP. I don't have it with me, but I believe Sean Graham provided you with one last week in Alberta.
Parties can run either just one single candidate or they can run a primary and a secondary candidate, but in addition, independent candidates can also be listed on the ballot, exactly the same as they are now. You have four different parties and then an independent or two. An independent can be elected in dual-member proportional in the same way as under first past the post, if they win the seat, but also if an independent candidate places second in the seat, that candidate will be elected to the second seat in that district.
In that way, it actually might lower barriers to independent candidates being elected. If you had two independent candidates and they were the first and second representatives, the first and second most popular representatives or candidates in that seat, then you would have two independent candidates in that seat.
The way that I understand mixed member proportional, potentially—I don't want to say; I could be wrong on this—independent candidates can run for the district seat and it's more complicated to have them run on the open lists. It can be done. In STV, we know the ballot is very complex. Independent candidates can be included, but it's very rare that they're elected.