+1 To what Glen said, if you want to be preaching then get the rest of your Relevance guys to practise what you preach. I've sure Glen is a perfectly balanced individual (although comparisons to Rodney King are a little odd), but as a company if you don't want the Grails vs Rails debate to Spring to life then don't bring it up yourselves.
Regarding Tiobe index, if you're arguing relative growth you could also look at Groovy's relative growth within this index. 6 months ago it was at 51st place, a year ago it was outside the top 100.
So "relatively" speaking 31st is pretty impressive ;-)