But this is merely to side step the point. The coach you believe should replace Martinez would only prove to be more proficient by utilizing the quality material he walks into the club and takes charge of - to use it in a more creative way. How else could your point about this squad being good enough, but the manager not, be confirmed?
In any case, it doesn't, in and of itself, explain why Martinez couldn't have the funds to do exactly what you feel needs doing. The only way to argue against it would be to explain how the players you talk of there (all either brought in or through by RM) were disenchanted by his management and ambition and that all evidence points away from Martinez being capable of using those funds well enough to both purchase good players and attain CL level points from them. You cant on both issues.