What do you believe you're showing here?
First of all, Cheddy and supposed first IE's dark skin colour doesn't establish any recent common origin between them so I don't understand why Cheddy is mentioned here -
In THE study where you found the above pictures, the relatively strong input in Central Italy seems rather late and the first input - verylight - only at IA - Could you develop your thoughts?
I don't know what these maps are based on. Surely very few and little things - so, western CWC were Tyrrhenian speaking? And what about topology? IE reached <eastern Europe only at IA? With so little changes in Y-haplo's and auDNA???
I like all these maps so often proposed as Bible words when they are based on almost nothing.
That said, the colours are very attractive!
From the well kown above paper mentioned by yourself:
[... Ancient genomes from Italy are very limited, with only sparse data available from the Neolithic to the Roman Republic period across the entire Italian mainland (fig. S1) (14–18). Individuals from the ancient city of Rome and its surroundings during the Iron Age and Roman Republic (900 to 27 BCE) harbored the predominant genomic components that characterize most Europeans from the Bronze Age onward (15, 17, 19, 20). In addition, three individuals were found to carry recent genetic influences from Africa and the Near East, a further demonstration of Rome’s wide connections across the Mediterranean as far back as the Iron Age. Unexpectedly, almost all individuals from the later, Imperial period in the vicinity of the Empire’s capital carried large proportions of eastern Mediterranean ancestry, which was later reduced during the Late Antique and Early Medieval periods (17). However, the extent to which these changes are representative of the processes that occurred across the rest of the Italian peninsula remains to be clarified from individuals outside the megacity of Rome and its ancient metropolitan area...]
I think you have a personal way to read papers?
I remains still this curious connexions between early IA Romans and Etruscans of the same time. More than an explanation could be theorized... Besides, eastern mediterranea connexions at MIA aren't equivalent to early IE's input (someones supposed geographically Iranians)