Matthew 23:3 'they say' vs 'he says'?

[judge]

But would Jesus -really- encourage his disciples, to DO what they Say? That would be a huge contradiction, since the Pharisees were asking things which were not in the Tanakh and caused a great burden on common people.

I dont see why not. I think all Jesus was doing was telling them to respect the authorities rather than resist them.
I think he was, as usual, emphasising that one must change inwardly to taste the Kingdom