1. Same Rajputs not only ruled Delhi for 450 years but literally established Delhi. Glory to great Anangpal Tomar.
2. Many Chauhan, Sisodiya, etc powers kept winning it at times even after that. It's just we don't boast about temporary wins like it's some conquest.
Rajputana's efforts had always been to stop any Hindu force conquering Delhi. Whether it's Marathas, Jats, Sikhs, rajputs sides with non Hindu forces to stop the Hindus.
Today they are pushed as Dharma Rakshaks on Hindus.