I agree that some might not have the proper disposition for receipt of justification via BoD, but they might have sufficient disposition for receipt of the sacrament of baptism:
I think you meant the opposite. The disposition for reception of justification is much easier to attain than the disposition for reception of baptism.
The bar for receiving justification is natural contrition for sins, which all men (even pagans) can attain, since all men have the natural law written on their hearts. All men can realize their sins and have NATURAL contrition, which God will hear and give them NATURAL justification (i.e. a state of being sin-free...but does not remove Original Sin.
The disposition for reception of baptism includes natural contrition for sins, and then also a) the knowledge/desire to enter the church and b) knowledge/desire to follow church laws for salvation. Once baptism is received, then one has the SUPERNATURAL removal of all sins, including Original sin. The baptized are in a state of SUPERNATURAL justification, which ONLY the sacrament can provide.