I would think so. You are describing eyewitness testimony, which is direct evidence (as opposed to circumstantial evidence, which is indirect evidence). Why wouldn't that be enough to convict?
Not legal advice as I don't practice law in Ohio. It's just my two cents on the facts you describe in light of general principles of law. If you need legal advice, please consult a lawyer who holds Ohio licensure.
If your questions is whether a witness could testify that they were told by another person that they saw the defendant taking the item and whether such testimony could be used as evidence against the defendant, the answer is generally no. All criminal trials are subject to the rules of evidence. An out of court statement being offered to prove the truth of the matter at trial would generally be inadmissable.
However, if the witness is testifying that they saw the defendant take the item that would be admissable as evidence.
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Possibly. It depends on the credibility of the witness and the jury's determination if the person is telling the truth. You can always challenge an eyewitness's testimony, but it is considered direct evidence.