Whatever Clarke did, was behind the scenes. There's no evidence he played any role in day to day decisions.
So Holmgren's refusal to rebuild, his patches before Hextall, and even the firing of Hextall are his decisions.
Clarke may have pushed to dump Hextall, but Holmgren was the decision maker at the time and if you listen to Scott, all he was doing was mouthing Holmgren's words. Holmgren set the strategy and tone for the organization, then rode off into the sunset as the building burned behind him. Clarke may have influenced the hiring of Chuck, but Holmgren was going to hire someone similar, a "hockey guy" and give him the same mandate to win now, the future be damned.
I don't think it was "either/or," I'm sure Holmgren and Clarke talked on a regular basis and were generally in agreement at the time.
Now where the splits are today, who knows?