Okay, a few thoughts and questions here.
1. Could be wrong but don’t think the source of CB’s phone data has been disclosed? It’s either from the initial 70k/3 day mast records or from some other source i.e. they have the phone or the SIM card. It’s possible they have both, likely using the mast data to confirm the other source?
2. This is perhaps a stretch but what if the SIM stolen from the Ocean Club is CB’s 2007 number? That would mean he is involved in burglaries at the Ocean Club, he was there on the night MM went missing and if it’s a match to the Alcossebre sighting and statement, well ... if I’m HCW and that witness statement is very credible or, if there is a photo from this sighting of a little girl (perhaps a match but not a definite ID) then a lot of HCW’s cryptic comments start to make sense.
3. What worries me about 2 is, even if LE do have a phone/SIM, would there be data on it that would give Alcossebre as a location? I don’t think so. But, if the call log is still accessible, then perhaps at the time of the sighting, matched to the time of EXIF data in the photos there is a call to Germany and a call to the UK or somewhere else where English would be a common language, then again, strong evidence.