Brian, as last seen, pre-scratching, has similar head-hair and facial-hair cuts and grooming. Eye colour is also a good match (visible when Brian is taking care of Tom’s fibre cable a few pages earlier). Glasses, not so much, but it’s at least plausible his glasses style could have changed. Clearly the normal-sized head that the little Solvers are bustling around is that of Wilfred E. Murstadt III (aka WEM3). I make this prediction with 100% confidence.

… that it is wrong.