He is considered the principal poet of the Heptanese school of poetry of which he was part of yet this set contained amongst others Aristotle Valaoritis, Ioannis Zampelios Spiridon Zampelios and Andreas Kalvos.
The reasoning for this is that Dionysios’s education on Zakynthos had been in Classical Greek and when he lived in Italy, Italian. When he tried to write in a more modern form (Dimotiki) it was extremely difficult for him as there were no poems to act as a reference since they were previously in Katharevousa. Therefore, he had to create a whole catalogue by himself.
It was himself that started the poetic revolution that questioned what version of the Greek language that people write in compared with how they talk. In typical Greek fashion this was only resolved in the 1970’s. So for approx 150 years they were unable to decide which should be the official versions.
Even Byron perhaps did not have that much effect on the Greek people although he did influence Dionysios. As usual this is not always corroborated by all the sites I have read but since people of similiar minds all tend to congregate in the same place he probably did have have an effect on him.
For perhaps a more authentic take and some clarity read this Dionysios Solomos.