I don't really feel as if there are any missing nakama, Im not saying I didn't want certain characters to be strawhats but I'm not sure I necessarily like the term missing because I feel like certain characters weren't added to the crew for a reason, its like back when Robin first joined the crew, I was pretty surprised and unsure about her joining at first, but I love Robin and Im happy she joined.
The only person who I wanted to come on the ship and be a part of the crew is Vivi and she's an honorary crew member (like I really wanted Vivi to join the main crew she was perfect for me and very interesting, and I still think they should have 1 more girl in the crew but Its hard to find another I like as much as Vivi.), Im fine with her not joining though, as she had a kingdom to take care of, and Alabasta Arc was so special because Vivi cared about her kingdom and I think it was best for her kingdom and her character development to stay behind.
See, I also like Kinemon and I think he fits the crew very well, but I don't want him to join the crew. Its not that i don't like him, I think him and momonosuke are awesome but He has a child and thats pretty strange for both of them to join especially since he cares so much for Momonosuke's welfare. Also Kinemon is from Wano and proud to be a samurai, I doubt he's leaving his country. I think he will be this Saga's honorary Strawhat.
Anyway, these statements are just how Im feeling.