There is a theory that she was on fire and that's why she was running flat out for port. If evidence of burning is found it would tend to support this theory. There is also some speculation that she had substandard coal due to a coal strike.
Interesting theories - and new to me. I assume these would just be curiosity-appeasers? This long after, there’s no cause of action.
Interesting since the company that won salvage rights to the wreck and has put on a touring exhibition of recovered artifacts sells pieces of coal recovered from the debris field at this show. Here is a link to the online store for coal. http://www.thetitanicstore.com/browse.cfm/titanic-authentic-coal/2,2.html
I think the coal bin fire is considered fact. the question related I have seen is if the bulkhead was weakened and gave way under water pressure early on (don’t recall compartment numbers but the location makes this a possibility for a 5th compartment flood cause, iirc).