Yeah, true, but there were even some at the time (Andrews, for one), who knew that the fire, although not a major one, did weaken the integrity of the wall. It seems that the Captain may have known that, too. It wasn't a conflagration, but it has been suggested that the fired simmered long enough to effect the molecular consistency of that wall. As for whether or not that played a part in any possible boiler stampede is forever unknown.
Oh, I never said that the boilers had broken through the bow's hull, only that the theory goes that they may have just rolled down and clumped in the bow. Also, keep in mind, when considering the tight space you mentioned, that those boilers were extremely heavy, which meant that they could reasonably tear havoc out of its surrounds, no matter how tight.
Like I've said, I don't necessarily agree with the theory of tumbling boilers, but I am presenting the reasoning behind it.
As for the article, I've already read it, a long time ago. Interesting stuff.
--Mark