It's not just the height, it's the ability of a tall player being there to take a contested mark. Yes, the players you've listed are all over 190cm - none of them has a noted aptitude for taking contested marks as a key forward target. And based on last week's game, we constantly bomb the ball into the forward line - is that players getting it wrong week after week after week, or are they kicking to some mythical contested marking forward?
We have two talls on our list, of genuine KP height (mid 190s+) who have shown they can take a contested mark in F50 with at least some consistency - neither of them are in the selected team.
I agree with this, we just need a get out option that we can kick long and have confidence that he is a good chance at marking. Williams certainly isn't, Bontempelli isn't (and is only 18, cannot be expecting him as a young inside mid to be also providing a forward target) Crameri is decent one on one and good at ground level but hes not really the jumping over the pack type and Grant hasnt got the frame for those strong contested marks and plays like a medium forward.
My preference for the 2nd half of the season is to see 4 talls/tall medium forwards with a choice from these 5 players (Jones, Crameri, Grant, Stringer, Redpath) and complement these 4 with a mix of Dahlhaus, Hunter, Hrovat, Gia and resting forwards etc. Grant & Crameri the leadup half forwards if we have Jones and Stringer deeper/ or Jones and Crameri as the lead up CHF's and Redpath and Grant closer to goal. Picking 4 of these talls also gives us extra coverage down back if Minno goes down and say Roughy has to end up in the ruck/ or if we need an extra tall defender. That way Stringer picks up the 3rd tall forward ( or can give small bursts at the centre bounce) and yet we still have 3 tall forwards.