To my knowledge, Quirrell, Macnair and Lockhart had no medical ailments to which Madam Pomfrey would have been privy, which might have made any difference in the outcomes.

And for Toshenka, never would I intimate he is incapable of the tasks Our Lord has asked of him; on the other hand, perhaps you are unaware that he recently refused St Mungo's interventions in favour of Madam Pomfrey's, making her, in effect, his personal Healer. Therefore, you see that you have created a conflict in approach to his continued recovery. Had you consulted anyone before undertaking this decision, rather than bumbling through things you do not understand, there are those who could have set you straight and avoided any potential embarrassment.