Totally agree although I'm not a fan of Marco you have to look at the facts
Marco is the one who slowed down the Big Mom crew
Marco is the one who stopped King and Queen at the same time to send Zoro to the roof
Marco is currently healing with his flames yous the samurai affected by the virus.
And all this while fighting Queen and King at the same time!
I don't know if you realize that it's a remarkable feat to dominate the 2 biggest forces on the enemy side besides Kaido.
It's not Whitebeard's right hand man for nothing