OK.
I'll do more research.
'proto' just means 'primitive
hobbits' - and certainly the ancestors of the hobbits were around, just as the
dwarves,
elves and
men were. So they had to have a proto-something in the same way the early elves etc. did.
As to the
Istari being abroad in the 2nd age, there's nothing in
Tolkien's writing saying they weren't... that's an assumption. It depends on what is done with our 'visiting
Gandalf'.
We do read somewhere of Gandalf 'walking among the elves from the very earliest times' as a cloaked old man, going about learning things. I'lll find it again... it could even be a
First Age reference. But this is, of course, external to LoTR and TH... and possibly even SIL... I can't recall and will need to find it.
We may FEEL like Gandalf shouldn't be there... but it's totally open territory, and again it depends on what is done with him. We know he has 'always had a fondness for hobbits'. Could it be this is the beginnig of that fondness?
I guess I'm currently a little more open-minded to the possibilities perhaps... but again I feel where Tolkien was totally silent, there's room for creativity. He never says Gandalf was completely absent from the
Second Age. And certainly, as we know he's 'afraid of
Sauron' before he comes in the Third, he has most likely had information, experience or even direct encounters with Sauron along the way before he shows up again around TA 1000.
Anyway, I'll look a little more closely. Maybe I'm off in the brush hiding from the
Nazgul.