Is Celtic's transfer approach really the best way?

[BBC]The summer transfer window officially opened on 15 June, 78 days ago.At the time of writing Celtic have just four new players to show for it.Four good players by the looks of things, that's important to note, but four all the same.An average of one signing roughly every 19 days.And while the official deadline for registering players for European competition doesn't arrive until Wednesday night, you could argue Celtic's real deadline passed some time ago.Because the window they truly needed