I think Loma should gain a bit more pro experience before fighting Walters. Don't want a repeat of Salido.
Top Rank definitely has some guys for him...Walters, Donaire, Gradovich would be good fights. Salido rematch or Rocky would be good fights too if he were to move up in a couple fights
Walters could only hurt Lomachenko if he landed clean on the chin or side of the head, which is hard to imagine considering his limited skills and Loma's superb footwork and defense. There is a higher chance of Walters being stopped than actually puling out a victory.
My current wishlist for Lomachenko fights: Walters Rigo Gradovich Selby LSC Mares Frampton Quigg Russell Mikey Garcia
World champion shouldn't need to gain more experience, he is good enough to win, though those fights you listed wouldn't be bad. Gardovich vs Selby winner, Vetyaka, Mares still hope he can get back to the form he was in pre Gonzales when many rated him borderline P4P, all good fights.
Would love him to end LSC's career tbh. No offense to LSC, just have enough of the bs associated with him
Would like to see him against a good pressure fighter next, one thing I have noticed is he doesn't seem to let his hands go when on the back foot, in the Russell Jr fight when Russell pressed and Lomachenko used his movement to make him miss he never really punished him on the back foot. Salido fight also had him on the move an thus less punch out put. If Lomachenko is allowed to come forward he is amazingly good at making you miss and finding angle to land shots, but on the back foot he makes you miss and doesn't seem to make you pay as much.