In the leaderboards for Time Trials, you can select whom to race against. Use the D-pad (or arrow-keys on PC) to select an entry on the leaderboard you want to race against.
This selects both what echo you will see, and whose time and split times you will see.
If you don't select anyone you will per default race against your own best time and echo, or if you haven't yet played the Time Trial, the best time on the leaderboard.
Comments
However I noticed it only does this for user generated ones and not the official ones.... unless I missed something.
There are no replays on dashes since that would spoil the fastest path, which is half the challenge.
Nvm. So you can watch echoes on time trials, but not dashes. That way confuses me for awhile there.