I know it's OT, but this thread got me thinking about Loghain, and his paranoid behaviour. Could he have been influenced by a blood mage without anyone knowing??
No, he had plenty of reasons to be whackadoo about Orlais from even before the events of the game. No need for any blood mage to cause it.
As for the OT, I think Bryce would have been against Loghain's takeover though he would have supported Anora in lieu of any other viable Theirin candidate (Alistair). Had he wanted the throne he would have taken it 5 years ago when Maric disappeared. I also think, had he lived, he would have opposed the civil war even starting up, though that was in direct cause because of Loghain's actions, actions I feel he may not have taken (or wouldn't have gotten as far as they did with Bryce around still to settle matters more appropriately). Where Loghain lacked subtlety and skill (which a politician needs) Bryce had and could have defused matters much more capably than the general.
And while I feel he wouldn't have been in support of Loghain the Regent, he would have been in full support of Loghain the General as long as he was dealing with the Blight. By which I mean, he wouldn't have supported poisoning Eamon, or the torture/bounty on nobles/Grey Wardens, or the slavery in the Alienage etc. And Howe would have lacked the influence on Loghain he exerted, so some plots may have been a moot point. This is not to say Howe did everything (I fully believe Loghain either hatched more than a few on his own, or at the very least was fully aware of what was being done in his name), at least it would have toned down a lot of the crap the country goes through under the hands of the tyrant at the helm.