At will is a bit exaggerated, he took him down when he dazed and had to do it out of desperation while Conor was focused on finishing the fight, when he actually tried to secure a takedown of his own work he got stuffed.
In regards to Mendes's wrestling when was the last time you actually saw him utilise it effectively? Against Lentz he was just laying on him and couldn't really pass Lentz's guard. Conor trains with two extremely high level grappler's in John Kavanagh and Gunnar Nelson so I think he will be okay if he get's taken down as Mendes hasn't really been able to damage from top position when he has got their in his previous fights. He really tries to go in there and knock guys out.
It is an intriguing fight but just feels like the wrestler tag has been overused on Mendes because of his background rather than how he as actually been fighting recently.
Another thing that I come back to is when DC fought Jon Jones, DC olympic calibre wrestler, probably the highest level wrestler in the UFC's history and he couldn't utilise that at all against Jon Jones, Jones's range and creative striking really nullified DC. It's just not very clear cut to me.