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Not really, that founding population could have mated with Denisovan before crossing the Wallace line.

Which is most likely what happened, IMO. Descendants of that population got outcompeted by later ooA migrations, other than small pockets such as Negritos, who also show high Neandertal DNA %.

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I am pretty sure there are no populations with high Denisovan ancestry on the Asian side of the Wallace line. Do you have a reference which describes such a population?

Philippine Negritos have high Denisovan %:

https://academic.oup.com/gbe/article/9/8/2013/3952725

Malaysian and Andamanese Negritos don't.

The Philippines weren't ever connect to Asia via a land bridge and Huxley's modification of the Wallace line (Huxley Line) runs between the Philippines and Borneo [1].

This paper is very interesting though as it provides clues as to how the Denosovian spread through the Sahul. It adds even more support that the new homo sp. found in the OA are Denosovian.

1. https://en.m.wikipedia.org/wiki/Wallace_Line

*high Denisovan % I meant.

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