I was more pointing out a striker who was better than Lafferty, admittedly on very limited evidence. And yes, I think Dundee will need better next season and Mullen will probably be moving to Dunfermline or ICT in January.
@Mr. Alli - see above - I was being tongue in cheek, as you've guessed; though I do have loads of time for Mullen. If he's happy coming off your bench then he could still have a role to play for you next season.
Edit to add: some folk, myself included, felt he would be better in one of the wide slots in a front 3. He covers the ground, chases everything, makes a nuisance of himself, and would probably still be good for 5-7 goals a season in that position.