That last swing looked good. I coached h.s. ball for 2 years then have donated my time to some of the local rec teams as well. I'd say his swing at that age looks good. Only thing I seen wrong was the bat looked alittle big for him (camera was far away so hard to tell).
My youngest nephew just finished his last year in tball and was crushing them into the outfield. He shotgunned a pitcher earlier in the year and thank God the ball hit the poor kid in the shoulder, because he never had time to react. If it would have hit him in the head it would have hurt him bad even with the softer ball.
If you ever wanna talk baseball hit me up through PM or something.