Realistically, I don't think we see Iafallo or Kempe actively shopped for at least 2 years. Comparatively, they are the future Killorn, Johnson, Palat, or Gourde of a Kings team coming out of a (hopefully) successful rebuild. If Vilardi, Byfield, Turcotte, Fagemo, Kaliyev, etc. can turn into top 6 players, then players like Iafallo and Kempe could be moved to fill holes. Now, if the Kings received an offer for an up and coming LD, I think they'd definitely listen, at least on Kempe.
Also, it's absolutely nuts how deep the Lightning are. I have to double check their roster every time I watch them play; holy moly are they loaded.