Craig Marshall needs work on his Technique, as he plays too high too often. This is usually something that can be improved upon, however, with enough Core Strength Training.
And he has a tremendous Frame for this Game ~ 6.5/275 with lengthy arms ~ combined with tremendous Fluidity and Lateral Agility. His Game is certainly raw, but the combination of Extension, Power, and Athleticism is very rare, and if he and the right coaching crew can harness his extraordinary set of skills, he could become a Force.
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