CHB is an overrated position as far as defending goes. How many game winning CHF are there going around? How many teams even employ a tall CHF these days? Bulldogs use Brad Johnson there, Demon's Russell Robertson etc.
As far as tall forwards go there aren't many top notch players. Lloyd, Neitz, Richo, Treadrea, Tarrant, Lynch/Bradshaw, Hall come to mind and you could make a case for a few others but a Carroll or Glass can be serviceable enough on most weeks. Other weeks Jak will go back there in his rebounding role.
Throwing him forward and back as Woosh tends to do is good I'd reckon. Woosh does work a lot on the basis of Match-ups and whilst Jak is posing problems for the opposition one way or another he'd have another couple of years in him.
The big plus Jako brings is leadership. He was in the middle of the huddle again on Sat night addressing the boys after the game. That's a side of his game that can't be underestimated.
BTW was 3 goals a career high?