Need help selecting keepers - WHIR

[peterdeluca09]

6 x 6 Roto (R, H, HR, SB, Avg, RBI / W, Saves, ERA, HR allowed, K, WHIP). We keep any 5 players as long as we wish, team is below;

C- Ramos, Perez
1B- Olson
2B- Altuve, Lux
SS- Bichette, Seager
3B- Machado (SS eligible), Carpenter
OF- JD Martinez, Puig, Cain, Benintendi, Upton, Mancini (1B eligible)
Utility- Andujar
SP- Morton, Gray, Wheeler, Paxton, Carrasco, Hamels, Cueto, Sale
RP- None

I'm leaning towards JD, Altuve and Bichette for sure. The last two is down to the following;

1. Olson (40-45 HR potential)
2. Lux (keeper for years to come)
3. Carrasco (huge comeback season ?)
4. Machado (4 straight years of 30+ HR)
5. Morton (If I don't keep him, I'll have no pitchers to start my draft and will have to concentrate on pitching the first few rounds where the tiers one and most of tier two starters will have been kept, making picks thin pickings).

I do have the first pick, so technically I get to keep 6, however the other teams will be exposing better players for me anyways. Unfortunately those keepers will be revealed on May 1st, just before the draft and I have to submit my list first.

Please help me. And if I can help with yours post, I will.