>>42358634
>that says nothing of power, just that the group itself was rare
When someone in a story says "something of this caliber" they are always saying they are powerful skilled or capable.
Also Celestia compared herself, Opaline and Sombra to these three so she was clearly talking about how powerful they are as Celestia would never insult herself by saying that she was not special. She also said they were powerful enough to kill Arinos.
Although it seems like Big Mac was the real gay man of the trio and not Braeburn.