From: PDX (and now) London, UK
It seems to me that DBB has more construction units/devices. In 2/44, I finally landed at Hansa Bay (like Jocke's other game, I'm behind schedule). Two days post capture of the base I followed up with over 800 engineers (engineers plus engineer vehicles) and the base was totally repaired and expanding. I just peaked out with almost 1400 engineers total. The Allies in DBB can build up bases faster than any JFB can imagine. Without any altitude restrictions (HR) the P-38 series is above average and the P-47s is just plain deadly (using newest air data by Symon).
So with the experience Jocke has gained from other game, he should be able to move forward rather quickly, IMO.
Believe me I know how fast he can go! I've seen it on the other side. no doubts about that.
My interest in commenting on the Allied side is to posit a more rounded view of the situation. If Japan does not defend heavily in the Marshalls/Gilberts (which is the part I was referring to, not the Solomons) ten they have more resources to defend more vital secondary locations. Now that I've experienced the Allied ability to move quickly, hop heavily defended locations, and build them up fast to support the next jump, I think it's detrimental for Japan to defend forward. The best defenses have not been those where the front has been heavily built, but those where the Allies were met with counter thrusts, surprises, and reinforcements or reinvasions.
So nothing really can be learned by the fact that extended perimeters are not heavily defended except that Japan did not have to use the men and materials to make them so.
"Success is the ability to go from one failure to another with no loss of enthusiasm." - Winston Churchill