TTDS 1.17a12 cancels out YSmenu?

When i downloaded my TTDS 1.17a12 it came with YSMenu and Moonshell. So I don't get it. Does YSMenu cancel out 1.17a12? YSMenu has it's own TTMenu. So how can my TTDS 1.17a12 have YSMenu too?

To put it simply, TTDS 1.17a12 is YSMenu. YSMenu wasn't designed by the official TTDS team though, they just sort of stole the work.

Not really, it's built upon the DSTT firmware. The author doesn't claim it as his own creation.