Jay Greene is dubious about Response To Intervention — trying to educate children well so they’re not diagnosed as learning disabled — because he thinks schools have an incentive to put kids in special ed.
Essentially, RTI frees-up money to get schools to do what they presumably should have been doing already — providing well-designed instruction in the early grades. Unless we think that the main impediment to well-designed instruction was that schools lacked the funding to do it, diverting 15% of special education money to early-grade instruction will not get them to do anything significantly different from what they were already doing.