It would be better to specialize in a generalist plant pollinated by another species

The same goes if you're a specialist pollinator. You're better off in the long run specializing on a generalist plant that gets pollinated by other species in times when you're not around to help. Finally, in addition to nestedness, the networks are usually modular. This means that the species in a network
are compartmentalized into modules of plants and animals that interact more with each other than with species in other modules. Think of them like social cliques.