Pirelli test driver? Toro Rosso's engineers have always been very impressed with his level of technical feedback, especially considering his age. Personally I think he's a better driver than Alguersuari, and Marko should base his decision on performances not results, especially as Buemi's had five DNFs that weren't his fault.
It's worth pointing out to those that say "he got beaten by Karthikeyan in India", he did actually have a problem with the right-rear hub of his car, forcing him to make an additional stop on the last lap. Ricciardo would have had Narain otherwise.
I don't see why STR must stick dogmatically with this either/or policy when both of their current drivers, along with the car, are much improved.They're doing so much better now, why rock the boat?