If u read the manga it hints at more Uchiha with ms
No one has to die it's merely trauma releasing the special brain chakra
He could've had ms he knew of shisui and itachis
We can't completely assess him we only know he was willing to go to war with the leaf he could preform fire jutsu he wasn't dumb and possibly the strongest Uchiha of his time as are all the other leaders before him
No, it does not.
In the 3rd databook, it confirms that everything Itachi told Sasuke during their fight were fabrications.
It is a fact that MS is awakened by either a) Killing the one closest to you or b) Witnessing the death of the one closest to you.
He didn't have MS. He just had 3-tomoe. Fugaku knew of Shisui's and Itachi's MS eyes since they showed them to him. The 3-tomoe users in the clan know what MS is since on the Nakano Shrine tablets, it says how to achieve it (death of a close one). They way the tablets work is that you can read a little more each eye power you advance. (Ex: 3-tomoe users read how to get MS---> MS users read how to get EMS--->EMS users read how to get Rinnegan--->Rinnegan users read how to achieve IT.) Some clan members with 3-tomoe, Fugaku included, read up to the MS part.
Shisui was stated to have the strongest genjutsu of his time, then he died. Itachi surpassed Fugaku at shurikenjutsu at age 10 and by the time he was 13 it was so obvious even an 8 year old like Sasuke could see it. Then Fugaku's 13 year old son certainly surpassed him upon awakening MS once Shisui died in front of him.
It's not embarassing. Itachi is just too damn good.
You're right, it's not embarrassing. But it does make it clear that his power level doesn't compare to the 4 Uchiha part 2 elaborated on (Itachi, Sasuke, Obito, Madara). The guy isn't anything to brag about.