Mudclaw might have gone to Starclan- I feel like I remember him being in the PoNS, but I could be wrong.
I haven't read Mapleshade's story yet either, but a lot of people seem to love her so I'm looking forward to reading it at some point. I absolutely adored Sol when he first showed up, but like you said [member=46]Ariel[/member] , he just sorta… fell flat. The Erins really seem to have trouble with making good villains as of late, at least imo.
Also I absolutely cannot stand Clear Sky – I'm only partway through book two of DotC but ughhhhh I just hate him so far