The fact is that the guards of both team will not have more than a little percentages of all the rebounds,so your guard can win the battle against his adversary,but the total number of rebound will be however relatively low,aslo if your guard is a great rebounder
When I trained a Sf some season ago,when I put him in PG position because of training he grabs 5-6 rebounds,when i put him at Pf or C he grabbed over double digit rebounds