A job share with two teachers is brilliant if managed well. My DS2 has Mr D on Mon, Tue & Wed. Mr D is the Deputy Head. He then has Mr E on Thurs & Fri. The rest of the week, Mr E covers PPA time for 6 other teachers.
Every parent in the school crosses their fingers that their DC get these teachers at least once when they go through the school, they are the best teachers in the school.
However, a job share between three teachers? I would NOT like that at all, no continuity at all. And unless they are VERY good teachers, I can't see how it can be good for the DC. If my DC had problems in that class, I would be making big noises to the LEA by the October half term.
How would the teachers ALL know about who bullies who, who works together well etc? And I would be very wary of it when ALL 3 teachers had senior roles to take on. Isn't this going to limit the time the SenCo has to work with struggling DC throughout the school? Surely that will affect way more DC's than just the ones in this class?!
IMO, it seems like it is purely for the school's benefit, not the pupils benefit. When was the last time these Deputy Heads or the SenCo actually taught a class?