I think of grazing or snacking as something for growing people - children and people trying to gain weight, whether muscle or to recover from illness.
As far as CICO, I haven't read anything that convinces me that over time, the time of day one eats is that big of a factor for the average person. It might be different for athletes. But logically, to me, it's either CICO, or it isn't.
We're all different. If grazing keeps you sated and you're not gaining fat, then it's good for you. I would never feel satisfied eating lots of small meals, so a big honkin' supper with little else throughout the day is good for me.
"Right is right, even if no one is doing it; wrong is wrong, even if everyone is doing it." - St. Augustine