With a clearer image of the owner’s plans for Purecoat North, the question of whether the town should allow its redevelopment under the MBTA Communities Act remains up for debate. Laurence Tosi, whose family has owned the metal-plate-making company at the corner of Brighton and Hittinger streets for 56 years, explained Monday night he has worked with the town over the last 25 years on ways the property could better serve the neighborhood. “It wasn’t until the MBTA 3A that…