Kaeo's weight is actually listed as higher than Addo Carr (182cm 90kg vs 183cm 89 kg). But that is still significantly smaller than Tom. Which probably is a good point - if the plan is to play him as a replacement for Tom, then it aint going to work. Either put Garrick back there or switch the game plan up so that players aren't targeted in defence and/or ineffective in attack.
The thing is though....how many times over the past decade has the same vitriol been thrown at whatever fill in fullback we had at the time? Funa, Wright, Garrick(initially), Walker and even Tom when he took over for Snake. IMO the problem is building your team around 1 or two players that have to fire to win...and then, when they are out, the whole team seams clueless. I wish people would look at the whole team when it happens, rather than picking the one fringe grader (or reliable back) who's been called up to fill in and who fails to lift the entire team.