Then don't have them as the subs... simple, eiso can cover leniu spot, till ivan is comfortable with putting both henry and smith on together during the year...
I don't think we'll see this happen anyway, chances are smith starts during the year at some point, whenever henry is on the bench, and one of fish or moses is benchie, or god forbid injured, but like i said Eisenhuth is probably the better choice, depending on who we are playing, if we are up against a tough pack, go with eiso, if not chance it with henry, or pick niether and have Alamoti on the bench or start martin in the middle, there are plenty of options