Its actually 2 wins in 4 games since he took over, and technically for teh first win Clavijo was still head coach but was in Uruguay dealing with a family emergency so Smith ran the team that game. It wasn't until the week following that win that Clavijo resigned.
And I doubt Arsenal will ever own the Rapids. Due to the "single-entity" legal structure of Major League Soccer nobody "owns" the teams, each "owner" is actually an investor in MLS LLC which is a single company. Think of the teams as the branch office of MLS LLC in each city. You have the Denver office (Rapids) the LA office (Galaxy), etc.
Even if that were to change KSE has sunk a lot of money into the Rapids and into building their stadium and I don't see them selling out to Arsenal. More likely is that Kroenke continues his take over of Arsenal and then merges both ARsenal and the Rapids into a "Soccer Operations" department of KSE or something.