Harsh. Police have been reviewing the evidence MIS passed to them for a fortnight, and now they've made this arrest - it's reasonable to speculate if the two are linked.
As for faith in the police investigation - I don't have a great deal. The investigation should have been stepped up in late October when it became highly probable that a criminal act had taken place. By this point it was apparent that Corrie couldn't have realistically left the Horseshoe area on foot in a reasonable time frame and that the phone had taken a route consistent with a bin lorry, and in addition the passage of time without contact made it statistically likely he had come to harm*. Yet it wasn't until January they searched the properties around the HS/SB Street, and that probably wouldn't have happened without being shamed into it. They still haven't searched the landfill, and it will by an order of magnitude harder with 4 months extra rubbish on top. I'm sure it's a resourcing thing - the two double murders last year won't have helped, and it does seem that since the new year this case has been given the priority it deserves, which is good, but the passage of time won't help.
* See page 20 of this report (LE link so presumably allowable)
http://www.missingpersons.police.uk/download/99