What evidence is there that gluons are even particles? They were originally proposed to supply an extra quantum number to comply with the Pauli exclusion principle. So gluons are supposed to carry a color-anticolor charge in order that the quarks in baryons would add up to the color white. But if gluons are particles, then they spend some time traveling between quarks. And during that time between quarks, the color addition of quarks is not white. This is a bit like asking if electrons in a Helium atom must have opposite spins (Pauli exclusion principle), then what tells one electron what spin the other electron has?