My ranking would be
- Linus (love! 100% a strong favourite for me)
- Zebedee (because I like the nickname Zed)
- Morris
(Edit to say: if we’re including Samson and Grover, my ranking would be 1. Samson 2. Linus 3. Grover 4. Zebedee 5. Morris!)
My favourite combo would be Linus Maxwell I think!
I’m not a fan of Zebedee, personally. Like I mentioned, I like the nickname Zed (Zeb less so, but it’s still a fine choice) but as a full name… I can’t lie, it sounds silly to me? It’s sort of giving “word that a magician would shout out before doing a trick”, like, abracadabra and zebedee? 
But I definitely don’t think it’s unusable, especially with an easy 3-letter nickname like you’re intending it to have. I simply don’t like it (and it feels rather unusual and extravagant next to Clyde and Warren - I personally care quite a bit about sibset cohesiveness, but it’s subjective!)