What are the implications of the words "Tachtav mi'Banav"?
Rashi: This implies that, if the Kohen Gadol has a son who is qualified to fill his father's place, he should be chosen to succeed his father as Kohen Gadol.
In the context of the Pasuk, what does "Asher Yavo el Ohel Mo'ed" come to preclude?
Yoma, 73b: It precludes the son of a Mashu'ach Milchamah from inheriting his father's position. 1
In spite of the fact, generally a son does inherit his father's position (such as that of a king)
What are the implications of the words "ha'Kohen Tachtav mi'Banav"?
Rashbam, Targum Onkelos and Targum Yonasan: 'The Kohen from among his sons who replaces him ... '. 3
What is the basic Pasuk coming to teach us? What is "Ohel Mo'ed" referring to?
Rashi and Rashbam: That when the Kohen Gadol's successor 1 - who is designated to enter the Kodesh Kodashim' on Yom Kipur is initiated, he should wear the Bigdei Kohen Gadol for seven days.
See Sifsei Chachamim.
Seeing as the Torah is referring to the Kodesh ha'Kodashim, why does the Torah refer to it as "Ohel Mo'ed"?
Oznayim la'Torah: Because in fact, the entire Heichal, including the Kodesh Kodashim, falls under th heading of 'Ohel Mo'ed', only the tTorah refers to the formder as "Ohel Mo'ed mi'Chutz la'Paroches', 1 and to the latter, as 'mi'Beis la'Paroches'. And sometimes, such as here, it refers to either independently as 'Ohel Mo'ed' S'tam.
See for example, 27:21.