The Blues struggled at times during the season when their injury toll mounted. Some of that was due to having to call on relatively inexperienced players not quite up to the required level.
Weepu's arrival would give the Blues a formidable look and ample choice. It could be strengthened further if Sonny Bill Williams decides to join as well - with the big midfielder battling to decide between the Crusaders, Chiefs and Blues.
Some may legitimately wonder how the Blues can afford so much quality and whether it is in the best interests of New Zealand rugby to have so many All Blacks stacked in one team.
The Blues have been arguing that if players want to come, they want to come. Since Lam took over, the franchise has stated a goal to try to change the perception of the Blues and make it a squad that players wanted to play for - rather than one they saw as a stepping-stone.
Improved performances in 2010 and 2011 have built confidence with recruits Mathewson and Stephen Brett talking in glowing terms about the lifestyle available in Auckland.
Weepu's shift will also throw the Hurricanes into deeper gloom after a dismal season where they played poorly and were obviously riddled with tension. With Nonu, Aaron Cruden going too, the next question is whether Hosea Gear will stay.
He is being chased by the Highlanders and with so many of his team-mates committing elsewhere, he too might make the jump and play in Dunedin next season.