Honestly I think Chakotay is the only name on this list with leadership qualities. Even though he spent most of the series agreeing with Janeway, he showed emotional maturity and an ability to deal with people.
Tuvok's a smart tactician but can't deal with personnel, same with Seven. Tom's too immature and distractible ("Ooh, an antique ship! Who cares there are Borg sightings in this area, let's expend a huge amount of ship resources to salvage it. Now if anyone needs me I'll be on the holodeck."), Harry can't deal with expectations being placed on him, Doc got too much to prove and, for a hologram, he's the most emotionally sensitive person on the ship ("Am I doing good? What, you think I can't command a ship cause I'm a hologram? I'm making history here! Now seriously, am I doing good?).
Just, he would be a lot more cautious than Janeway.