but most importantly, she knows that none of this would ever have happened without the support and encouragement of her teammates, all of whom have grown particularly close to one another.

1. whom 대신에 who 안되죠?
2. whom은 of 뒤에 쓰여서 목적격 형태로 쓰인건가요? 그런데 주어를 대신하므로 주격 관계대명사인가요?
아니면 all of whom을 묶어서 주격으로 봐야 하나요? ㅜ
3. 접속사+대명사로 고칠시 ~ her teammates and all of them have grown ~ 맞나요?

1,2,3 답변부탁드려요 ~~~!