The arrival of Buddy and XU-b0t, who are more reliable, take more initiative and are more likely to obey orders, has made Mechakolos and Sledg completely redundant. So, the two have decided to leave Clint City, on the search for a place where they might once again be of use.
From Wednesday, June 29th 17.00 GMT +2, Mechakolos and Sledg will no longer be available in the shop’s packs. However, players who already own them can continue to use them as normal. Sales of the two characters on the Market will be blocked until the morning of Wednesday, June 29th.
Buddy and Xu-Bot are compared to Mechakolos and Sledg not because they are actually more reliable or statistically redundant in combat, but simply done so for a little bit of lore and backstory as to why they are leaving. Think of it as newer robots (card release dates) replacing old ones that are potentially breaking down.