Hey, I wrestled for 15 solid years. State level. Freestyle, greco roman, and schoolboy.
Honestly in wrestling, weight is way overrated.
Your kid will have more stamina and will be quicker.
The thing you should be focusing on is his defense, work with him on counter moves more than anything. Another important thing that a lot of younger guys overlook when there in high school is stamina. This is all part of your defense, and that is the #1 undisputed best quality to have. The best wrestling matches in the world are all defense. kids his age dont focus on that, they focus on offense.
Have him run 45 minutes in the morning, consisting of slow jog and sprints, keeping his heart rate up. Then another 30 minutes at night. All throughout the season. This is a must.
Trust me when i say that though, my freshman year in high school i weighed 150 pounds, and wrestled most of the season at 135.
I made varsity freshman year so I would go the whole day of weigh ins without eating or drinking anything, no showers nothing. Then after school, i would put on about 5 or 6 layers of sweats, and start doing sprints for a good 2-3 hours, alot of times more, soaking out as much water as possible.
Atleast 75% of the time i was still atleast 2 or 3 pounds over, so i would go into the bathroom shove my hand down my throat and puke up everything left in my stomach.
I would shave all my hair, rub a couple out, weigh in naked, anything to drop an ounce or two.
THen after I made weigh ins I would go home and put my 15 pounds back on before the tourny next day. I did this for the first half of the season, and my energy level was ridiculously low, no stamina whatsoever. I only won about 3/4 of my matches, which for me is terrible, even being a freshman wrestling guys 3 years older than me. I took state in freestyle 2 years in a row, nobody was going to fuckin beat me.
But i was fooled into thinking weight was everything, like most wrestlers do. I wrestled 145 for the remainder of the year with no losses, just focused on my energy level.
SO my advice is dont push his body to hard, start very slowly, a little muscle will always help, but it is not needed.
Just work on his defense, counters. Make him unstoppable, if you can do that than no one will beat him, no matter how good his offense is. When the bigger guys get worn out, he will be the more powerful one. Tell him to NEVER stop moving.
Another thing I did that i dont recommend was i would take caffiene pills an hour before my match and munch on candys and carbs.
A mountain dew and a few packs of skittles might be okay for him though.
Hope you guys good luck, post his progress .