A recently learnt that there is a gloun field that also is seen as the reason for mass. A gloun has spin a Higgs boson doesn't. What stands against assuming they are the same particle in and out of spin? And what is there against the idea that the missing graviton is the field that causes this spin of the Higgs boson thus becoming a gluon just before entering a string? If so I then don't see how this graviton can ever be detected, other than as a theoretical necessity.

What stands against assuming they are the same particle in and out of spin?

Because we don't know what that means...

 

But you are right, the Higgs gives mass to free fundamental particles. But for bound states it is more complicated.

 

Also, are you asking about QCD sum rules and gluon condensates?