Whether the investigating judge had to be recused for apparent bias
Yes. The judge's correspondence objectively created an appearance of partiality and could raise doubts about impartiality.
Under Art. 29 CPP and constitutional impartiality guarantees, recusal is required when objectively established circumstances create an appearance of bias, even without proof of actual prejudice. Referring to the disputed sum as 'misappropriated' suggested a preconceived view on the merits.