Actually there is no reasonable ground to believe the ECHR would look into the issue at all. There is no reasonable ground to believe that defence submission to the ECHR will be significantly different from the reasons for recourse they had submitted to the SC, which were only about the usability of Knox statements (the delay of counsel was raised before the investigating judge and declared manifestly inadmissible).
There can't be an ECHR ruling that "clarifies the ground to restrict access to counsel in Italy"; the ECHR can't rule on "grounds that work in Italy", the Convention is valid everywhere and general; the ECHR also cannot establish the specific regulations; moreover it also has already an orientation acknowledging "good reasons" among which there's "effectiveness of criminal investigation".
The argument about motivations is pointless: motivations are made for judges, not for the ECHR, and the purpose of written motivation would be to request an investigating judge. But Mignini did not present a request to prolong the delay.
There are several misstatements in this post. Here are the facts:
1. The ECHR will point out any Italian law or constitutional provision that does not conform to the Convention, if it finds any such nonconformance. Its judgment overrides domestic law. The Committee of Ministers of the Council of Europe will supervise Italy in any corrective action. Italy is obligated to follow the ECHR final judgments, as are all the CoE States.
2. The statement above that uses the terms "good reasons" is in error. The actual wording is {emphasis added}:
55. Against this background, the Court finds that in order for the right to a fair trial to remain sufficiently “practical and effective” (see paragraph 51 above), Article 6 § 1 requires that, as a rule, access to a lawyer should be provided as from the first interrogation of a suspect by the police, unless it is demonstrated in the light of the particular circumstances of each case that there are
compelling reasons to restrict this right.
"Compelling reasons" are much stronger than "Good reasons".
Full Definition of COMPELLING
: that compels: as
a : forceful <a compelling personality>
b : demanding attention <for compelling reasons>
c : convincing <no compelling evidence>
good
adjective \ˈgu̇d\
: of high quality
: of somewhat high but not excellent quality
: correct or proper
from full definition of good:
e (1) : well-founded, cogent <good reasons> (2) : true <holds good for society at large> (3) : deserving of respect : honorable <in good standing> (4) : legally valid or effectual <good title>
ETA: ECHR statement from Salduz 36391/02 | Judgment (Merits and Just Satisfaction) | Court (Grand Chamber) | 27/11/2008
Definitions from
http://www.merriam-webster.com/dictionary