Regulates cubitus interruptus (ci) processing by recruiting multiple kinases to promote its efficient phosphorylation. Scaffolds multiple kinases and ci into proximity to promote its hyperphosphorylation; which then targets it for SCFSlimb/proteasome-mediated processing to generate its repressor form. Hh signaling inhibits ci phosphorylation by interfering with the cos-ci-kinases complex formation. {ECO:0000269|PubMed:15691767; ECO:0000269|PubMed:9244298}.