From all reports Schuster can be a star 5/8 but he is still only 19 and will take time in first grade to hit his straps and play at a high level. Considering DCE is aging our window for a premiership with this current spine is 1-2 years. Bringing in Foran is the right move to make and he immediately fills a lot of weaknesses we have which is someone to organise and direct play alongside DCE and provide another solid kicking option to take pressure off DCE and make it harder for defenses to apply kick pressure. Our attack is way to predictable with Turbo currently out because defenses know everything will run through DCE and Manly has no other real threat outside of him.
Schuster will be able to provide a lot of utility off the bench as a ball playing backorder and build up his first grade experience. Once Foran retires he would naturally step into that 5/8 spot.
To further expand upon my point on how bad our kicking options are, these are the current kicking stats from the game vs Melbourne:
DCE: 17 kicks for 654 meters
Cust: 2 kicks for 34 meters
Now that is just ridiculous and is the main reason why we struggle so much for possession currently. No other team in the NRL has this much imbalance in kicking metrics. I know a lot of people death-ride DCE here but he literally gets no help from players around him.