I would say wrestling is the best base when you are firs breaking in to MMA but you have to develop other skills along the way because just wrestling won't be enough.
Of all the GOATs it seems like nost of them were wrestlers with MT and BJJ tied in second.
Lidell (though he never really used it)
They all started out as wrestlers or predominately use wresting in their style.
However really its hard to say their a wrestler when their really an MMA fighter
"The fat man flies at midnight"