They're not really redeploying the E195 to operate DSA-NQY, it seems to me they have a golden opportunity to tap into the Yorkshire / Notts market with little competition and the NQY route looks like a useful filler for otherwise pretty busy aircraft …
With the new link road to DSA the Sheffield City region is unserved in terms of a major city region and it seems a good move by flybe if you ask me ...