Question: Whence do you derive R. Yehudah's position that he does not rely on Bereirah?
Answer: From the Beraisa wherein R. Yehudah prohibits taking Terumos and Ma'aseros from wine (and being allowed to designate and be Mechalel it) before Shabbos, and on Shabbos leaving it over in the bottle.
Question: Perhaps his rationale to prohibit there is as taught, out of concern that the bottle might break (a concern which R. Meir does not share)?!
Answer: From R. Yehudah's position prohibiting making a condition this way and that on two Chachamim.
Question: Why is one Chacham different than two?
Answer: It is speaking where the Chacham has already arrived, and only the student is unaware of his direction.
According to R. Yochanan, that, too, is unrelated to Bereirah.
Question: But if R. Yehudah does not rely on Bereirah, and he does rely on Kesivah, then make two shelves and mark them!?
Answer: The Kohen Gadol, in his weakened state, may not pay attention to the writing.
If weakness were not the reason, and we could rely on the alertness of the Kohen Gadol;
Then the greater quantity of Dam Par would be enough of a differentiation between the Damim.
And if we assume that he only received an equal amount of Dam from the Par as from the Sa'ir;
We were taught by R. Yehudah that all the Dam must be collected.
And if quantity is not reliable (owing to spillage) then their color would differentiate them.
It must be the weakness of the Kohen Gadol.
CONSISTENT HALACHIC POSITIONS IN THE MUSAF PRAYERS
Rava pointed out to the Sh'liach Tzibur that his prayer was inconsistent.
His prayer spoke of two shelves, like the Chachamim.
He mentioned picking up the Dam Par before setting down the Dam Sa'ir, like R. Yehudah).
Rava told him to rather say put down the Dam Sa'ir first and make it consistent with the Chachamim.
THE SECOND HAZA'AH IN THE HEICHAL
From "ve'Chein Ya'aseh" we learn that the Haza'ah in the Heichal is identical to that in the Kodesh ha'Kodoshim.
This includes the number of Haza'os as well as the manner in which they were sprinkled.