He just doesn't have enough help
With Murray out, this was probably ultimately the Nuggets ceiling.
But I'll disagree somewhat with giving him that excuse. Guy played like a beast down the stretch without Murray and carried the team. And played very well in the first round series victory over the Blazers. The Blazers with all their weapons back were no slouch.
By his standards, he laid an egg in the Suns series. He did not personally play anywhere near his MVP level play against PHX. Regardless of his help.