Softwords: Mordechai was a member of sanhedrin, and therefore his smicha was real smicha – an unbroken chain from Moshe Rabeinu.
Today nobody has real smicha. So you can’t compare listening to today’s talmidei chachomim with Mordechai.
And in fact, many “Grand Rabbis” today who believe themselves to be “Daas Torah”, don’t even have the smicha of today.