Jeffrey Combs was great in the role. Playing Shran
put JC in the minority of Trektors having played multiple ST alien species. JC's predecessor's being the late Mark Lenard
& the iconic Marc Alaimo
Those facts aside:
What would Shran had been like played by Marc Alaimo? How different would Shran have been?
Was Marc Alaimo ever
The late Andreas Katsulas
- TNG's Romulan Commander Tomalak & B5's Ambassador G'Kar
- had he not tragically died, would've been great casting as Shran
Honestly, I can't see anyone but Combs as Shran. I could be prejudiced on that issue, though.
As for Katsulas, he was the Vissian captain in "Cogenitor."