It realy depends on what u mean by cementing legacy i think.

If he wants his legacy to be a former P4P number 1 who won the WBC title in 5 divisions, and was one of the best fighters of his era, then he has done that and that is a pretty good legacy.

If cementing his legacy means being the greatest fighter of his era, and maybe top 20 P4P all time well he is darn close but may need one or two more big name fights to do that, and could easily do so.

If cementing means the greatest fighter ever then he is nowhere near, and because older fighters are looked upon with rose coloured glasses he never will be. To be top 5 P4P all time he'd probably have to win 5 more top line fights and beat someone of note at 160.

Reality is his legacy is already very good, probably top 3 of current fighters, is that enough?