Gus having a win over Manuwa isn't a huge deal. Bader and Davis would both beat him and all the top 10 in the LHW would beat Manuwa as well. Here is a list of fighters in lighter divisions that would also beat Manuwa.
Vitor
Anderson
Hendo
Sonnen
And the list goes on and on.
Vitor
Anderson
Hendo
Sonnen
And the list goes on and on.