A team withdraws prior to the first round of a club championship. In a later round, one of the intended members of the team acts as substitute. Is this within the law?
Yes. The team has withdrawn without being constituted and therefore shall be regarded as not having entered the competition. Any intended member of that team may act as a substitute in another team DR 2.2.6
At the completion of a round in a tournament the skip wishes the third and second to change position. Is this permitted?
Yes. Prior to the start of any subsequent match in the same competition the playing positions of the constituted personnel may be changed. DR 2.2.8