They dealt with a few issues like this in other Toyotas, I wanna say it was the Sienna and maybe the Tacoma(?) when I worked in the parts dept. of a Toyota dealer. We used to have a lot of cam sprockets and sometimes camshafts and other assorted timing components on the recall/warranty shelf constantly. Of course this is a Subaru motor, but just know that it's not an uncommon problem for vehicles in general. Hang in there guys and gals! You know that Subaru and Toyota won't leave you hanging. It's a complicated engine, having Dual-AVCS means four of these thingies instead of plain old fixed metal gears:
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Current: 2005 Porsche 911 Carrera S 6MT
Previous: 2 BRZ's, 997 C2S, C5 RS6, C4 S6, B8 S4, GDB STi, S30 240Z, FC3S RX-7 TII, AW11/SW20 MR2, E30 318is/325i, etc.