None of them were ever particularly front lined never mind side lined. Occasional appearances during quite a short lived time in the case of Romilly and Geriant.
I think you could argue Geriant was particularly prominent for a time being, he presented the Evening News every Friday and often in other days with Mark Austin often seemingly away in that period. He also presented many lunchtime bulletins and regularly at weekends. Indeed, he was as prominent/high-ranking as Nina was then and as Charlene, Ranvir and Rageah are now. He did also present News at Ten on a couple of occasions, once alongside Julie in the studio and once on location on what was dubbed the 'Big Freeze'
It doesn't seem a case of being sidelined though perhaps, he is after all Middle East Correspondent which would make it difficult to do news reading duties given his base, I was aware towards the end of his time based in the UK, he was on less but that was likely due to the fact the Lunchtime news became single-headed and Mark and Alistair covered for each other rather than as was the case in the past, Alistair being on London Tonight and unable to, hence the need for another anchor. If he were to be based in the UK again, it would be interesting to see if he would crop up from time to time. He did anchor on location, a Weekend bulletin a couple of years back that he was reporting on also but the details escape me. I always thought he was given a hard time when he presented and was actually a good anchor.