If I thought I had just seen a missing child with some people, I would call 911 and then stay on those people like decomp on carpet until local LE took over.
Caylee looks like 5 million other little girls out there, there are bound to be some very well intentioned sightings. LE is checking out the lead. They have to, otherwise the defense claims that LE did not investigate credible leads.
If LE does investigate the lead, then defense says - "even LE doesn't think she is dead, because they are still looking for a live Caylee".
The spin will continue. Meanwhile, Caylee is lost somewhere in the whole mess.
It is just a sad story all the way around.