DKP is obsessed with comparing their characters with Gods and Goddesses despite of being aware how flawed their characters are.
The comparison of Kartik and Naira with Radha and Krishna can only be valid if they are compared as lovers and soulmates but
Kartik and Naira got married unlike Radha and Krishna.
Kartik and Naira have been parents to two children unlike Radha and Krishna.
Kartik and Naira have ego clashes unlike Radha and Krishna.
Kartik and Naira had multiple separations unlike Radha and Krishna.
Kartik and Naira got divorced unlike Radha and Krishna.
Kartik and Naira got remarried unlike Radha and Krishna.
Kartik and Naira's wedding is not null and void by law after 5 years unlike Radha and Krishna who never got married.
Let's talk about comparison between Rukmini and Vedika
Rukmini, the princess of Vidarbha was Krishna's first wife and chief queen (Patrani) of Dwarka whereas Vedika is Kartik's second wife that also not as per law. Their marriage is not acceptable as per law of country.
Krishna eloped with Rukmini to save her from getting married to someone she doesn't love whereas Kartik was forced and emotionally blackmailed by his family to get married to Vedika.