From the bits I've seen and read; Leonard is a very athletic midfielder. Tallish (6'1), strong, quick, covers large areas, tackles well, working box to box. He's scored some goals at Southend, but hasn't usually played in the most attacking role. He can do a marking job at defensive set pieces, and also increase our aerial threat in the opposition box. He'll add the option of a long throw and as the captain of Southend will add leadership qualities. At 25 he's approaching his peak years as a midfielder, and several players' improvement under Wilder is something that bodes well for him. He seems to have remained popular with the Southend fans, despite asking for a transfer and being very keen on the move to us.
What we shouldn't expect is playmaker qualities like Coutts. In that respect I don' think he adds more than Lundstram either, so creativity, flair and the right touch of arrogance shouldn't be expected. But he's got a lot of qualities that we haven't got and I really look forward to seeing how he fits in, how Wilder wants to use him and which (if any) tactical tweaks he'll do to get the most out of him. We haven't had many similar midfielders previously, as many have seemed to be either a limited work horse or a passer with limited athleticism. I think the closest we've had in midfield would be Jagielka when he played there.