Looking through some of the suggested greatests in that thread:
335 & 339 - Next volume of Rogue Trooper should give us 5 from both of these
228 - We've got everything but the Mean Arena already and we're not getting that
503 - I don't think we're getting that Dredd but I think we'll suspect we'll get the Slaine and Bad Company soon
653 - No Zenith

and I'm not convinced we'll be getting that Rogue Trooper either
1634 - Don't think we're gettng Cradlegrave and with only 1 book of Savage getting to Book 5 seems unlikely
178 - No Dash Decent or Mean Arena but we already have everything else
Seems ironic that 415 is right in the middle of Time Killer.