Don't really have an opinion as to the chair and the like, but as far as the horn goes. Mat is heading up there to get his horn back, and I'm reasonably certain he's going to succeed at it, and what with him being so lucky and all, it seems quite possible him getting there might very well correspond with and attack on the white tower that may happen, during which, he'd likely end up leading the defending forces.
It Works in Theory: The Amyrlin's Anger
in Theory Blog
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Don't really have an opinion as to the chair and the like, but as far as the horn goes. Mat is heading up there to get his horn back, and I'm reasonably certain he's going to succeed at it, and what with him being so lucky and all, it seems quite possible him getting there might very well correspond with and attack on the white tower that may happen, during which, he'd likely end up leading the defending forces.