My take is that La Liga and Barca maintain Messi is a Barcelona player so if possible it's better to get an agreed transfer as it reduces the chance of subsequent litigaton.Still don’t understand, if Messi is not a Barca player now, why are they so keen (reportedly!) to do a deal through Bartomeu?!
If we are 100% convinced that Messi can be regarded as a free-agent then negotiating with Barcelona is an act only of good faith and we can dictate terms.