What are your thoughts on the Time Lord The Eleven and his incarcerations? Is he a poor man’s Master or would you say he’s more interesting?

Personally I think the gimmick of past incarnation’s still living in a time lords brain is an interesting scenario tho I’m not sure how I feel about the Eleven considering he’s apparently a character the Doctor has met an unknown amount of times and we the viewer only find out about him in the Doom coalition boxset. Makes you wonder how many incarnations the Doctor has met tho The fifth Doctor was aware of the Nine so at least knew of him by repretation