The only real issues, are the speculation, and uninformed opinion by arm chair experts etc.
As has been made clear several times, about several aspects of the search including my self. The search works on probabilities of the information they deem is the most reliable at the time.
The authorities at each step of the way (Australian side) have always said the "best so far" or "most credible". It has also been stated that they are sharing that data with various outside organizations for separate analysis.
This all takes time, hence they will keep searching at the "most probable" site until they have other information to go on. If some of that data is found to be not valid, then they will rejig the search accordingly.