Theodoros Kolokotronis is a very interesting character from the Greek War of Independence and despite me killing him in this timeline, he is probably my favorite figure from the war. He was incredibly important in developing the Greek resistance in 1821 and 1822, and I can honestly say that he is largely responsible for the protecting the independence of Greece in those first two years. That said, his actions in 1823 and 1824 were extremely harmful to the Greeks so my decision to have him die at Dervenakia was an attempt to get the best moments of Theodoros Kolokotronis, Dervenakia, without his worst ones, his short tenure in the Executive and the civil wars.All very interesting, well written and obviously well researched but I think the effects of Kolokotronis death would start from bad and go to catastrophic very fast. To start with Dervenakia, they happened only due to Kolokotronis correctly deducing that Dramalis was actually to retreat and capturing the passes behind him with what essentially consisted of units that personally followed him and close allies. If he's killed there is a very fair chance they just melt away and Dramalis retreats unscathed to Corinth to wait out on the Ottoman fleet to supply him. Even if we assume Panos and Niketas keep the units in place (Panos was after all a fairly good commander by all accounts) it's highly doubtful that the revolution can survive Ibrahim without Kolokotronis around. Kolokotronis may have failed to directly defeat Ibrahim but was attriting him to death with his army hardly controlling anything but the ground they were standing on, which by the way is why leaving Tripoli intact is a bad thing, while at the same time keeping the population from surrendering. (It was Kollokotronis "fire and axe against surrendered" decree that stopped the surrenders that had started taking place on their tracks. Remove him and Ibrahim is bound to steadily reduce the Peloponnese through 1825 and 1826.
I will admit that there is some hand waving involved to get the OTL result for Dervenakia with the added death of Theodoros Kolokotronis. My understanding of Dervenakia is that once the Ottomans entered the hills near Dervenakia, the OTL outcome was almost guaranteed one way or another regardless of who was actually in charge at that point which is a testament to Theodoros' oberservation and organization leading up to that battle and the terrible ineptitude of Dramali Pasha and the Ottomans. Obviously some details are going to be different but the Ottoman's supply situation still is on the verge of collapse, their morale is already low as a result of a relatively pointless venture to Argos, they are taking the same route back to Corinth, a route defended by the same Greeks as OTL, and while Theodoros died on the night of the first day, it does take some time for that news to reach all the Greeks in the area.
I will agree that Kolokotronis' war of attrition certainly worked in the long run against Ibrahim, but Ibrahim is still plagued by the same problems of he dealt with in OTL, more or less and attrition, albeit to a lesser degree, is still an issue for him even without Theodoros. The Ottomans essentially refuse to support him in the Peloponnese, he can only be reinforced from Egypt, and his father is very mercurial about Egypt's involvement in the war. The Siege of Missolonghi both OTL and TTL was especially taxing on him physically, he was injured in the leg, and tactically as he lost over a third of his entire force between January and April of 1826 alone. The Greek resistance against him is also stronger and more united than OTL due in large part to the mitigated "civil war' between the Greeks in TTL, so they have some more resources to throw at Ibrahim that they didn't in OTL. That said, Ibrahim will be very destructive and in some ways he will be worse than OTL. Still I defer to your knowledge on the topic and if something seems incredibly unlikely or impossible please let me know and I will modify it to the best of my ability.