You are aware of course that Rabbi Hillel (roughly contemporary with Christ or a little before) taught that the commandments to love God and to love one's neighbor as oneself "are the Law and Prophets; all else is commentary"? Maybe not . . .
Reciting the shema daily isn’t the same as keeping it. He may have been a “good” man, but unless his righteousness came from God, all his own deeds were worthless. you have no way of knowing what the man was like, nor does anyone but God
If the rabbi with his dying breath said instead of “I” kept it, that the Lord preserved him in keeping it, you might have a point
and not only that, you have no way of knowing what the man may have said about Christ in his lifetime