“‘Have you understood
Συνήκατε ταῦτα πάντα; λέγουσιν αὐτῷ Ναί.
Only Matthew has this question for his disciples. Jesus wanted to be sure that his disciples understood what he was talking about. Thus, he asked them (λέγουσιν αὐτῷ) if they understood everything that he was talking about (Συνήκατε ταῦτα πάντα). They responded that they did with a positive yes (Ναί). Obviously, some may have understood better than others. However, they all understood something.