Analysis of information sources in references of the Wikipedia article "How to Train Your Dragon: The Hidden World" in English language version.
"In early drafts of 'Dragon 3', we did focus on the return of Drago. I'd always intended to give more dimension to the character by showing a redeemed version of him by the development of 'Dragon 3.' Midway through the development of 'Dragon 3' I was asked to come up with a fresher take that wasn't dependent on 'Dragon 2.' ... So very wisely, Steven Spielberg had said to me, 'The redemption story of Drago requires so much screen time you don't have in order to really sell it properly, and you would do yourself a disservice to try to force it in.'
"In early drafts of 'Dragon 3', we did focus on the return of Drago. I'd always intended to give more dimension to the character by showing a redeemed version of him by the development of 'Dragon 3.' Midway through the development of 'Dragon 3' I was asked to come up with a fresher take that wasn't dependent on 'Dragon 2.' ... So very wisely, Steven Spielberg had said to me, 'The redemption story of Drago requires so much screen time you don't have in order to really sell it properly, and you would do yourself a disservice to try to force it in.'