[winoneforthegipper]

Not sure about your first two contentions but your third one seems to be in lockstep with their hypothesis?

Those were three independent and objective looks at the Icelandic hotspot, it will be continued to noticed as one due to other factors eroding the tetra as quick as it does but I think if you reanalyze your hot plume graph:

http://www.seismo.unr.edu/ftp/pub/louie/class/100/harvard-plumes.GIF

you will note that it is in agreement that there is not a hotspot plume under or near Iceland.

[winoneforthegipper]

A lengthy PDF file on the magma intrusion under Eyjafjöll.

http://www.vedur.is/media/vedurstofan/utgafa/skyrslur/2009/VI_2009_013.pdf