The first bird in your second post is clearly a juvenile Tree Sparrow - the chestnut crown and streaked back can be seen on this photo. Also the tail does not seem to be forked as on a grosbeak.
The bird in the first post is less clear, but I think this also looks like a tree sparrow - the bill does not look large enough for a grosbeak.
The other bird (photos 2-3 in the second post) is a male Grosbeak.
Juvenile grosbeaks look like the adults (overall plain grey-brown, dark wings, heavy pale bill) but are browner on the head than the adult.
