I know! He could have played the whole "part of a magical family, yet always unable to join in!" thingy I lot more!
There seems to be a definite sea change with Fiest's later books - away from the all-powerful sorcerers and improbably skilled thieves to more common characters caught up in events bigger than themselves. The whole Eric von Darkmoor series is bit like "Sharpe-like" (erm, that's a book series by Bernard Cornwell set in the Napoleonic era btw for any non-brits - they made a popular mini-series over here with Sean Bean
) and concerns the struggles of a few soldiers trying to accomplish their missions as best they can.
It's a welcome change (though I'd be a liar if I said I didn't miss the Pug & Tomas adventures!
)
Anyway - slightly got off the point there...
William does play a slightly bigger part in the later books but it does tend to focus a lot on Eric's adventures so all he ever appears to be is another captain amongst captains - I agree it's a shame mind you. I think Fiest must have decided not to create a dynasty out of Pug's family and so didn't make William the star of these new books and instead go for a brand new character who's also a commoner - no protection of powerful friends and family then!