Cream was a collaborative effort, especially "Fresh Cream", but ultimately, if it was anybody's band it was Jack Bruce's. As his career moved on, Bruce was able to recreate the Cream sound with other musicians, in particular Gary Moore, but Clapton never sounded the same. In his defense I believe Clapton would argue that he never wanted to sound like Cream again.
Regarding Mick Taylor, the Stones were a very capable band before Taylor and even now they can still rock as well as anyone, but their level of musicianship peaked during the Taylor years. No, he wasn't the creative equal of the Jagger/Richards duo, but it's widely reported that he was denied numerous writing and producing credits during his stay with the Stones.