Dodo Evolution

An hypothetycal evolutionary lineage of the Mauritius Dodo Raphus cucullatus (bottom) and Rodriguez Solitaire Pezophaps solitaria (top). I always imagined the transition between the ancestor, an African Pigeon, to the final stage of these large doves. Did the family is polyfiltetic? Raphus solitarius isn't included, since it was in fact an ibis.