Yeah, but we're not talking the Adventureland side of the structure here... that's Tortogua Tavern... this is Pecos Bills on the side facing the river and the rest of frontierland.
This area has always been a transition band.. using the corner and pathway on the far side as part of the transition to Adventureland. Much of the styling of Pecos bills is in that missionary/spanish style to easy that change over as you round the corner.
Note the roof of Peco and stucco of Peco's differs from the structures right next to it on the frontierland side... fitting more with Pirates.. yet still has this very wood rustic fence line and porches like frontierland. It's like a blend in itself to try to make that changeover.
The old 'outpost' building is actually working pretty much against it in terms of supporting that changeover... but I think because the hard cut isn't really supposed to be until the archway.
The issue here is you could make the entrance over by the outpost and the outpost itself more a nebuous transistion that is less 'frontierland' and maybe more bayou.. but you still have BTMRR as the thorn in your side.