[aerohead]

1) Barra Peak is a PhD candidate student at the University of Colorado, Boulder, Colorado.
2) ' findings suggest' implies a hypothesis, not a theory.
3) We're now talking timetables between 1-Billion years ago and 500-million years ago.
4) Barra et al. are describing a 'horizontal' dyke assemblage intrusion of metamorphosed sedimentary rock ( which was once vertical ), in a vertical strata ( which was once horizontal ).
5) 'Helium' was present as cosmic gas which was part of the solar nebula from which all planets accreted, and not dependent upon radioactive decay.
6) You'll notice that the rocks were already 'dated' when the helium was considered. That would have been accomplished by radioactive parent-daughter products of Carbon, Uranium, Thorium, Potassium, and Rubidium.
7) I don't know what Vaagisha Singh's credentials are.
8) The 'missing' material is attributed to 'erosion.'
9) NASA / JPL has considered schemes involving high-temperature evaporation of of silicates ( lithosphere ) from planetary surfaces and found them to be unrealistic due to amounts of material involved ( Fegley B. & Cameron, A. G. Earth planetary Science Letters 82, 207-222 ( 1987 ).