Oly 5050 and DS-50 Substrobe

Hi,

Is a single DS-50 substrobe sufficient to cover the range of focal lengths covered by the 5050 zoom? I'd like to travel with a light weight and easily packable set-up and since I already have the DS-50, will one be enough? If so, the next question is if I add-on a WA adapter, am I correct in presuming that I then will require two strobes for full coverage at the wide end? And, ultimately, would 2 DS-50s be sufficient (they are smaller, lighter and I don't need another charger)

Any input would be greatly appreciated.

Thanks!!!!

Gerry