Yes they can eat the crumbles. I have had some that for a very few days that they pick out the smaller stuff and leave the bigger chunks. Not always but sometimes. When that happens, I put the crumbles in a blender and break them down to smaller size. Usually within a couple of days, they will eat the larger chunks. Somne people use a hammer and cloth.
I can't explain why chickens do what they do. Many people have trouble getting their chickens to eat the Layer pellets when they switch over to Layer from Grower crumbles. I mixed mine, expecting a problem and trying to transition them in. Mine picked out the pellets and left the Grower crumbles behind. You try to do what is logical and they confuse you every time.